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Journal Cover   Inorganics
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  This is an Open Access Journal Open Access journal
   ISSN (Online) 2304-6740
   Published by MDPI Homepage  [140 journals]
  • Inorganics, Vol. 3, Pages 309-331: Structural and Electronic Properties of
           Polyoxovanadoborates Containing the [V12B18O60] Core in Different Mixed
           Valence States

    • Pages: 309 - 331
      Abstract: This review summarizes all published data until April 2015 related to crystalline lattices formed by the [V12B18O60] core, which generates polyanionic clusters with different degrees of protonation and mixed-valence ratios. The negative charge of this cluster is counterbalanced by different cations such as protonated amines, hydronium, and alkaline, and transition metal ions. The cluster is shown to form extended 1D, 2D, or 3D frameworks by forming covalent bonds or presenting hydrogen bond interactions with the present secondary cations. These cations have little influence on the solid state reflectance UV-visible spectra of the polyanionic cluster, but are shown to modify the FT-IR spectra and the magnetic behavior of the different reported species.
      PubDate: 2015-07-03
      DOI: 10.3390/inorganics3030309
      Issue No: Vol. 3, No. 3 (2015)
  • Inorganics, Vol. 3, Pages 332-340: Activity and Stability of the
           Tetramanganese Polyanion [Mn4(H2O)2(PW9O34)2]10— during
           Electrocatalytic Water Oxidation

    • Pages: 332 - 340
      Abstract: In natural photosynthesis, the oxygen evolving center is a tetranuclear manganese cluster stabilized by amino acids, water molecules and counter ions. However, manganese complexes are rarely exhibiting catalytic activity in water oxidation conditions. This is also true for the family of water oxidation catalysts (WOCs) obtained from POM chemistry. We have studied the activity of the tetranuclear manganese POM [Mn4(H2O)2(PW9O34)2]10—(Mn4), the manganese analog of the well-studied [Co4(H2O)2(PW9O34)2]10— (Co4), one of the fastest and most interesting WOC candidates discovered up to date. Our electrocatalytic experiments indicate that Mn4 is indeed an active water oxidation catalysts, although unstable. It rapidly decomposes in water oxidation conditions. Bulk water electrocatalysis shows initial activities comparable to those of the cobalt counterpart, but in this case current density decreases very rapidly to become negligible just after 30 min, with the appearance of an inactive manganese oxide layer on the electrode.
      PubDate: 2015-07-08
      DOI: 10.3390/inorganics3030332
      Issue No: Vol. 3, No. 3 (2015)
  • Inorganics, Vol. 3, Pages 341-354: Synthesis and Characterisation of the
           Europium (III) Dimolybdo-Enneatungsto-Silicate Dimer,

    • Pages: 341 - 354
      Abstract: The chemistry of polyoxometalates (POMs) keeps drawing the attention of researchers, since they constitute a family of discrete molecular entities whose features may be easily modulated. Often considered soluble molecular oxide analogues, POMs possess enormous potential due to a myriad of choices concerning size, shape and chemical composition that may be tailored in order to fine-tune their physico-chemical properties. Thanks to the recent progress in single-crystal X ray diffraction, new POMs exhibiting diverse and unexpected structures have been regularly reported and described. We find it relevant to systematically analyse the different equilibria that govern the formation of POMs, in order to be able to establish reliable synthesis protocols leading to new molecules. In this context, we have been able to synthesise the Eu3+-containing silico-molybdo-tungstic dimer, [Eu(α-SiW9Mo2O39)2]13−. We describe the synthesis and characterisation of this new species by several physico-chemical methods, such as single-crystal X-ray diffraction, 183W NMR and electrochemistry.
      PubDate: 2015-07-13
      DOI: 10.3390/inorganics3030341
      Issue No: Vol. 3, No. 3 (2015)
  • Inorganics, Vol. 3, Pages 355-369: Vanadium(V)-Substitution Reactions of
           Wells–Dawson-Type Polyoxometalates: From [X2M18O62]6− (X = P,
           As; M = Mo, W) to [X2VM17O62]7−

    • Authors: Tadaharu Ueda, Yuriko Nishimoto, Rie Saito, Miho Ohnishi, Jun-ichi Nambu
      Pages: 355 - 369
      Abstract: The formation processes of V(V)-substituted polyoxometalates with the Wells–Dawson-type structure were studied by cyclic voltammetry and by 31P NMR and Raman spectroscopy. Generally, the vanadium-substituted heteropolytungstates, [P2VW17O62]7− and [As2VW17O62]7−, were prepared by mixing equimolar amounts of the corresponding lacunary species—[P2W17O61]10− and [As2W17O61]10−—and vanadate. According to the results of various measurements in the present study, the tungsten site in the framework of [P2W18O62]6− and [As2W18O62]6− without defect sites could be substituted with V(V) to form the [P2VW17O62]7− and [As2VW17O62]7−, respectively. The order in which the reagents were mixed was observed to be the key factor for the formation of Dawson-type V(V)-substituted polyoxometalates. Even when the concentration of each reagent was identical, the final products differed depending on the order of their addition to the reaction mixture. Unlike Wells–Dawson-type heteropolytungstates, the molybdenum sites in the framework of [P2Mo18O62]6− and [As2Mo18O62]6− were substituted with V(V), but formed Keggin-type [PVMo11O40]4− and [AsVMo11O40]4− instead of [P2VMo17O62]7− and [As2VMo17O62]7−, respectively, even though a variety of reaction conditions were used. The formation constant of the [PVMo11O40]4− and [AsVMo11O40]4− was hypothesized to be substantially greater than that of the [P2VMo17O62]7− and [As2VMo17O62]7−.
      PubDate: 2015-07-14
      DOI: 10.3390/inorganics3030355
      Issue No: Vol. 3, No. 3 (2015)
  • Inorganics, Vol. 3, Pages 370-373: Frontiers in Gold Chemistry

    • Authors: Ahmed Mohamed
      Pages: 370 - 373
      Abstract: Basic chemistry of gold tells us that it can bond to sulfur, phosphorous, nitrogen, and oxygen donor ligands. The Frontiers in Gold Chemistry Special Issue covers gold complexes bonded to the different donors and their fascinating applications. This issue covers both basic chemistry studies of gold complexes and their contemporary applications in medicine, materials chemistry, and optical sensors. There is a strong belief that aurophilicity plays a major role in the unending applications of gold.
      PubDate: 2015-08-24
      DOI: 10.3390/inorganics3030370
      Issue No: Vol. 3, No. 3 (2015)
  • Inorganics, Vol. 3, Pages 374-387: Water Oxidation by Ru-Polyoxometalate
           Catalysts: Overpotential Dependency on the Number and Charge of the Metal

    • Authors: Simone Piccinin, Stefano Fabris
      Pages: 374 - 387
      Abstract: Water oxidation is efficiently catalyzed by several Ru-based polyoxometalate (POM) molecular catalysts differing in the number, local atomistic environment and oxidation state of the Ru sites. We employ density functional theory calculations to rationalize the dependency of the reaction overpotential on the main structural and electronic molecular properties. In particular, we compare the thermodynamics of the water oxidation cycle for single-site Ru-POM and multiple-site Ru4-POM complexes. For the Ru-POM case, we also investigate the reaction free energy as a function of the Ru oxidation state. We find that the overpotential of these molecular catalysts is primarily determined by the oxidation state of the metal center and is minimum for Ru(IV). In solution, the number of active sites is shown to play a minor role on the reaction energetics. The results are rationalized and discussed in terms of the local structure around the active sites and of the electrostatic screening due to the molecular structure or the solvent.
      PubDate: 2015-09-02
      DOI: 10.3390/inorganics3030374
      Issue No: Vol. 3, No. 3 (2015)
  • Inorganics, Vol. 3, Pages 55-81: Turning-On of Coumarin Phosphorescence in
           Acetylacetonato Platinum Complexes of Cyclometalated Pyridyl-Substituted

    • Pages: 55 - 81
      Abstract: Two pyridine-functionalized coumarins differing with respect to the site of pyridine attachment to the coumarin dye (3 in L1 or 7 in L2) and with respect to the presence (L1) or absence (L2) of a peripheral NMe2 donor were prepared and used as cyclometalating ligands towards the Pt(acac) fragment. X-ray crystal structures of complexes 1 and 2 show strong intermolecular interactions by π-stacking and short Pt∙∙∙Pt or C-H∙∙∙O hydrogen bonding that result in the formation of sheetlike packing patterns. The NMe2 donor substituent has a profound influence on the absorption and emission properties of the free coumarin dyes; L1 emits strongly while L2 is only weakly emissive. On binding to Pt(acac) the strong fluorescence of L1 is partially quenched while coumarin phosphorescence is observed from cyclometalated L1 and L2. The ligand-centered nature of the LUMO was confirmed by IR spectroelectrochemistry while the assignment of the phosphorescence emission as ligand-based rests on the vibrational structuring, the negligible solvatochromism, the small temperature-induced Stokes shifts on cooling to 77 K, the emission lifetimes, and strong oxygen quenching. (TD-)DFT calculations confirm our experimental results and provide an assignment of the electronic transitions and the spin density distributions in the T1 state.
      PubDate: 2015-04-17
      DOI: 10.3390/inorganics3020055
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 82-100: A Heteroaromatically Functionalized

    • Authors: Merinda Healey, Stephen Best, Lars Goerigk, Chris Ritchie
      Pages: 82 - 100
      Abstract: A new heteroaromatic thiophene containing organoimido functionalized hexamolybdate has been synthesized and characterized in both solid form and solution. Structural analysis shows successful introduction of the organoimido ligand through replacement of one terminal oxo site on [Mo6O19]2− to yield the singly functionalized hexamolybdate. Spectroscopic and theoretical analysis indicates charge transfer between the inorganic and organic components, with a significantly red-shifted lowest lying transition of 399 nm vs. the parent Lindqvist ion of 325 nm. Additional characterization includes, thermal gravimetric analysis (TGA), infrared (IR), cyclic voltammetry (CV), nuclear magnetic resonance (NMR) and time-dependent density functional theory (TD-DFT) studies.
      PubDate: 2015-05-08
      DOI: 10.3390/inorganics3020082
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 101-117: Microwave-Assisted Routes for the
           Synthesis of Complex Functional Oxides

    • Pages: 101 - 117
      Abstract: The synthesis of complex functional inorganic materials, such as oxides, can be successfully performed by using microwave irradiation as the source of heat. To achieve this, different routes and set-ups can be used: microwave-assisted synthesis may proceed in the solid state or in solution, aqueous or not, and the set ups may be as simple and accessible as domestic oven or quite sophisticated laboratory equipment. An obvious advantage of this innovative methodology is the considerable reduction in time—minutes rather than hours or days—and, as a consequence, energy saving. No less important is the fact that the particle growth is inhibited and the broad variety of different microwave or microwave-assisted synthesis techniques opens up opportunities for the preparation of inorganic nanoparticles and nanostructures. In this work, various microwave synthesis techniques have been employed: solid-state microwaves, single-mode microwaves using a TE10p cavity and microwave-assisted hydrothermal synthesis. Relevant examples are presented and discussed.
      PubDate: 2015-05-12
      DOI: 10.3390/inorganics3020101
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 118-138: Five Coordinate Platinum(II) in
           [Pt(bpy)(cod)(Me)][SbF6]: A Structural and Spectroscopic Study

    • Pages: 118 - 138
      Abstract: The five coordinate organoplatinum complex [Pt(bpy)(cod)(Me)][SbF6] (cod = 1,5-cyclooctadiene, bpy = 2,2’-bipyridine) was obtained reacting [Pt(cod)(Me)Cl] with Ag[SbF6] and bpy and characterized by multiple spectroscopy (IR and NMR) and single crystal XRD. Although the application of the τ values for the discrimination between trigonal bipyramidal vs. square pyramidal coordination fails, the molecular structure can be unequivocally described as basally-distorted trigonal bipyramidal. Detailed multinuclear NMR spectroscopy in solution at ambient temperature gives strong evidence for the same structure; corresponding low-temperature measurements down to −70 °C revealed no marked dynamic processes.
      PubDate: 2015-05-13
      DOI: 10.3390/inorganics3020118
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 139-154: Gilded Hope for Medicine

    • Authors: Mohamed Naggar, Ihsan Shehadi, Hanan Abdou, Ahmed Mohamed
      Pages: 139 - 154
      Abstract: Gold is emerging as a potential therapeutic agent in the treatment of arthritis, cancer and AIDS. The therapeutic mechanism of arthritic gold drugs and their modification in the presence of stomach hydrochloric acid, in the joints, and in the presence of mild and strong oxidizing agents is a matter of debate. It is believed that gold affects the entire immune response and reduces its potency and limits its oxidizing nature. DNA apparently is not the main target of gold in cancer treatment. Rheumatoid arthritis, cancer, heart diseases and recently AIDS have all been targeted with gold nanoparticles therapy. The era of gold nanoparticles started with cancer imaging and treatment studies. Gold nanoparticles have emerged as smart drug vehicles.
      PubDate: 2015-05-15
      DOI: 10.3390/inorganics3020139
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 155-159: Stayin’
           Alive—Organoplatinum Complexes

    • Authors: Axel Klein
      Pages: 155 - 159
      Abstract: Starting very early, with the findings of Zeise, or Pope and Peachey, organoplatinum complexes were studied intensely in the 1970s and 1980s and were found to be quite stable and very versatile. From then on, the number of publications on organoplatinum complexes has more than doubled in each subsequent decade, and organoplatinum complexes have stretched into many fields of application today. This introduction to the Special Issue on “Organoplatinum Complexes” spans from the history of organoplatinum complexes to the seven manuscripts published in the frame of this Special Issue, representing some of these fields.
      PubDate: 2015-05-19
      DOI: 10.3390/inorganics3020155
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 160-177: Polyoxoniobates and Polyoxotantalates
           as Ligands—Revisited

    • Authors: Pavel Abramov, Maxim Sokolov, Cristian Vicent
      Pages: 160 - 177
      Abstract: This short review summarizes our contribution to the coordination chemistry of noble metals (organometallic fragments of Rh, Ir, Ru and hydroxo Pt(IV)) and polyoxocomplexes of niobium and tantalum.
      PubDate: 2015-05-20
      DOI: 10.3390/inorganics3020160
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 178-193: Biomolecules Electrochemical Sensing
           Properties of a PMo11V@N-Doped Few Layer Graphene Nanocomposite

    • Authors: Diana Fernandes, Marta Nunes, Ricardo Carvalho, Revathi Bacsa, Israel-Martyr Mbomekalle, Philippe Serp, Pedro de Oliveira, Cristina Freire
      Pages: 178 - 193
      Abstract: A novel hybrid nanocomposite, PMo11V@N-doped few layer graphene, was prepared by a one-step protocol through direct immobilization of the tetrabutylammonium salt of a vanadium-substituted phosphomolybdate (PMo11V) onto N-doped few layer graphene (N-FLG). The nanocomposite characterization by FTIR and XPS confirmed its successful synthesis. Glassy carbon modified electrodes with PMo11V and PMo11V@N-FLG showed cyclic voltammograms consistent with surface-confined redox processes attributed to Mo-centred reductions (MoVI→MoV) and a vanadium reduction (VV→VIV). Furthermore, PMo11V@N-FLG modified electrodes showed good stability and well-resolved redox peaks with high current intensities. The observed enhancement of PMo11V electrochemical properties is a consequence of a strong electronic communication between the POM and the N-doped few layer graphene. Additionally, the electro-catalytic and sensing properties towards acetaminophen (AC) and theophylline (TP) were evaluated by voltammetric techniques using a glassy carbon electrode modified with PMo11V@N-FLG. Under the conditions used, the square wave voltammetric peak current increased linearly with AC concentration in the presence of TP, but showing two linear ranges: 1.2 × 10−6 to 1.2 × 10−4 and 1.2 × 10−4 to 4.8 × 10−4 mol dm−3, with different AC sensitivity values, 0.022 A/mol dm−3 and 0.035 A/mol dm−3, respectively (detection limit, DL = 7.5 × 10−7 mol dm−3).
      PubDate: 2015-05-20
      DOI: 10.3390/inorganics3020178
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 194-218: Single-Crystal to Single-Crystal
           Reversible Transformations Induced by Thermal Dehydration in Keggin-Type
           Polyoxometalates Decorated with Copper(II)-Picolinate Complexes: The
           Structure Directing Role of Guanidinium

    • Pages: 194 - 218
      Abstract: Three new hybrid inorganic-metalorganic compounds containing Keggin-type polyoxometalates, neutral copper(II)-picolinate complexes and guanidinium cations have been synthesized in bench conditions and characterized by elemental analysis, infrared spectroscopy and single-crystal X-ray diffraction: the isostructural [C(NH2)3]4[{XW12O40}{Cu2(pic)4}]·[Cu2(pic)4(H2O)]2·6H2O [X = Si (1), Ge (3)] and [C(NH2)3]8[{SiW12O40}2{Cu(pic)2}3{Cu2(pic)4(H2O)}2]·8H2O (2). The three compounds show a pronounced two-dimensional character owing to the structure-directing role of guanidinium. In 1 and 3, layers of [{XW12O40}{Cu2(pic)4}]n4n− hybrid POM chains and layers of [Cu2(pic)4(H2O)] complexes and [C(NH2)3]+ cations pack alternately along the z axis. The hydrogen-bonding network established by guanidinium leads to a trihexagonal tiling arrangement of all copper(II)-picolinate species. In contrast, layers of [C(NH2)3]+-linked [{SiW12O40}2{Cu(pic)2}3]n8n− double chains where each Keggin cluster displays a {Cu2(pic)4(H2O)} moiety pointing at the intralamellar space are observed in 2. The thermal stability of 1–3 has been studied by thermogravimetric analyses and variable temperature powder X-ray diffraction. Compounds 1 and 3 undergo single-crystal to single-crystal transformations promoted by reversible dehydration processes and the structures of the corresponding anhydrous phases 1a and 3a have been established. Despite the fact that the [Cu2(pic)4(H2O)] dimeric complexes split into [Cu(pic)2] monomers upon dehydration, the packing remains almost unaltered thanks to the preservation of the hydrogen-bonding network established by guanidinium and its associated Kagome-type lattice. Splitting of the dimeric complexes has been correlated with the electron paramagnetic resonance spectra.
      PubDate: 2015-05-27
      DOI: 10.3390/inorganics3020194
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 219-229: Manganese-Substituted Myoglobin:
           Characterization and Reactivity of an Oxidizing Intermediate towards a
           Weak C-H Bond

    • Authors: Kari Stone, Joey Hua, Humdoon Choudhry
      Pages: 219 - 229
      Abstract: Metal-substituted hemoproteins have been examined by biochemists for decades, but their potential for diverse functionalities has not been thoroughly investigated. By replacing hemoproteins with non-native metals, heme-containing proteins could be capable of performing a range of chemistries not allowed for in the native protein. The metal within the heme of the oxygen-carrying hemoprotein, myoglobin, can readily be replaced with other first row transition metals such as cobalt, chromium and manganese. Upon oxidation with two-electron oxidants (ex. meta-chloroperbenzoic acid), an oxidizing intermediate is produced in manganese-substituted myoglobin. Electron paramagnetic resonance analyses confirm the oxidation of Mn(III) to Mn(IV). With the addition of weak C-H bonds of 1,4 cyclohexadiene, hydrogen atom abstraction is exhibited by the oxidizing intermediate that displays a second-order rate constant of 2.79 +/− 0.22 M−1 s−1 by the metal-oxo species. The replacement of the iron ion with a manganese ion at the active site of myoglobin displays oxidative capabilities that are not shown in native myoglobin.
      PubDate: 2015-05-27
      DOI: 10.3390/inorganics3020219
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 230-245: Understanding the Regioselective
           Hydrolysis of Human Serum Albumin by Zr(IV)-Substituted Polyoxotungstates
           Using Tryptophan Fluorescence Spectroscopy

    • Authors: Vincent Goovaerts, Karen Stroobants, Gregory Absillis, Tatjana Parac-Vogt
      Pages: 230 - 245
      Abstract: The interaction between human serum albumin (HSA) and a series of Zr(IV)-substituted polyoxometalates (POMs) (Lindqvist type POM ((nBu4N)6[{W5O18Zr (μ-OH)}2]·2H2O, Zr2-L2), two Keggin type POMs ((Et2NH2)10[Zr(PW11O39)2]·7H2O, Zr1-K2 and (Et2NH2)8[{α-PW11O39Zr(μ-OH)(H2O)}2]·7H2O, Zr2-K2), and two Wells-Dawson type POMs (K15H[Zr(α2-P2W17O61)2]·25H2O, Zr1-WD2 and Na14[Zr4(P2W16O59)2(μ3-O)2(OH)2(H2O)4]·10H2O, Zr4-WD2) was investigated by tryptophan (Trp) fluorescence spectroscopy. The fluorescence data were analyzed using the Tachiya model, ideally suited for multiple binding site analysis. The obtained quenching constants have the same order of magnitude for all the measured POM:protein complexes, ranging from 1.9 × 105 M−1 to 5.1 × 105 M−1. The number of bound POM molecules to HSA was in the range of 1.5 up to 3.5. The influence of the ionic strength was studied for the Zr1-WD2:HSA complex in the presence of NaClO4. The calculated quenching constant decreases upon increasing the ionic strength of the solution from 0.0004 M to 0.5004 M, indicating the electrostatic nature of the interaction. The number of POM molecules bound to HSA increases from 1.0 to 4.8. 31P NMR spectroscopy provided evidence for the stability of all investigated POM structures during the interaction with HSA.
      PubDate: 2015-05-29
      DOI: 10.3390/inorganics3020230
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 246-266: Synthesis, Characterization and Study
           of Liquid Crystals Based on the Ionic Association of the Keplerate Anion
           [Mo132O372(CH3COO)30(H2O)72]42− and Imidazolium Cations

    • Pages: 246 - 266
      Abstract: A series of eight new materials based on the ionic association between 1-methyl-3-alkylimidazolium cations and the nanometric anionic Keplerate [Mo132O372(CH3COO)30(H2O)72]42− has been prepared and characterized in the solid state. The liquid crystal properties of these materials were investigated by the combination of Polarized Optical Microscopy, Differential Scanning Calorimetry and Small-angle X-Ray Diffraction showing a self-organization in lamellar (L) mesophases for the major part of them. From the interlamellar spacing h and the intercluster distance ahex, we demonstrated that the cations are not randomly organized around the anionic cluster and that the alkyl chains of the cations are certainly folded, which limits the van der Waals interactions between the cations within the liquid crystal phase and therefore harms the quality of the mesophases.
      PubDate: 2015-06-05
      DOI: 10.3390/inorganics3020246
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 267-278: Synthesis and Characterization of
           8-Yttrium(III)-Containing 81-Tungsto-8-Arsenate(III),

    • Authors: Masooma Ibrahim, Bassem Bassil, Ulrich Kortz
      Pages: 267 - 278
      Abstract: The 8-yttrium(III)-containing 81-tungsto-8-arsenate(III) [Y8(CH3COO)(H2O)18(As2W19O68)4(W2O6)2(WO4)]43− (1) has been synthesized in a one-pot reaction of yttrium(III) ions with [B-α-AsW9O33]9− in 1 M NaOAc/HOAc buffer at pH 4.8. Polyanion 1 is composed of four {As2W19O68} units, two {W2O10} fragments, one {WO6} group, and eight YIII ions. The hydrated cesium-sodium salt of 1 (CsNa-1) was characterized in the solid-state by single-crystal XRD, FT-IR spectroscopy, thermogravimetric and elemental analyses.
      PubDate: 2015-06-11
      DOI: 10.3390/inorganics3020267
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 279-294: Fully Oxidized and Mixed-Valent
           Polyoxomolybdates Structured by Bisphosphonates with Pendant Pyridine
           Groups: Synthesis, Structure and Photochromic Properties

    • Pages: 279 - 294
      Abstract: Hybrid organic-inorganic polyoxometalates (POMs) were synthesized in water by the reaction of a MoVI precursor with bisphosphonate ligands functionalized by pyridine groups. The fully oxidized POM [(MoVI3O8)2(O)(O3PC(O)(C3H6NH2CH2C5H4NH)PO3)2]4− has been isolated as water insoluble pure Na salt (NaMo6(Ale-4Py)2) or mixed Na/K salt (NaKMo6(Ale-4Py)2) and their structure solved using single-crystal X-ray diffraction. The mixed-valent complex [(MoV2O4)(MoVI2O6)2{O3PC(O)(C3H6N(CH2C5H4N)2(MoVIO3))PO3}2]8− was obtained as an ammonium salt (NH4Mo6(AlePy2Mo)2), in the presence of a reducing agent (hydrazine). 31P NMR spectroscopic studies in aqueous media have allowed determining the pH stability domain of NH4Mo6(AlePy2Mo)2. NaMo6(Ale-4Py)2 and NaKMo6(Ale-4Py)2 exhibit remarkable solid-state photochromic properties in ambient conditions. Under UV excitation, they develop a very fast color-change from white to deep purple and proved to be the fastest photochromic organoammonium/POM systems. The coloration kinetics has been fully quantified for both salts and is discussed in light of the hydrogen-bonding networks.
      PubDate: 2015-06-11
      DOI: 10.3390/inorganics3020279
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 295-308: Structure Transformation among Deca-,
           Dodeca- and Tridecavanadates and Their Properties for Thioanisole

    • Authors: Yuji Kikukawa, Kazuhiro Ogihara, Yoshihito Hayashi
      Pages: 295 - 308
      Abstract: The transformation of three types of polyoxovanadates, {(n-C4H9)4N}3[H3V10O28], {(n-C4H9)4N}4[V12O32] and {(n-C4H9)4N}3[V13O34] have been investigated according to the rational chemical equations, and the best transformation conditions were reported. By the reaction of [H3V10O28]3− with 0.33 equivalents of {(n-C4H9)4N}OH in acetonitrile at 80 °C, [V12O32]4− was formed with 92% yield. The reaction in nitroethane with 0.69 equivalents of p-toluenesulfonic acid gave [V13O34]3− with 91% yield. The 51V NMR observation of each reaction suggests the complete transformations of [H3V10O28]3− to [V12O32]4− and to [V13O34]3− proceeded without the formation of any byproducts and it provides the reliable synthetic route. Decavanadates were produced by the hydrolysis of [V12O32]4− or [V13O34]3−. While the direct transformation of [V13O34]3− to [V12O32]4− partly proceeded, the reverse one could not be observed. For the thioanisole oxidation, [V13O34]3− showed the highest activity of the three.
      PubDate: 2015-06-17
      DOI: 10.3390/inorganics3020295
      Issue No: Vol. 3, No. 2 (2015)
  • Inorganics, Vol. 3, Pages 19-20: Acknowledgement to Reviewers of
           Inorganics in 2014

    • Authors: Inorganics Office
      Pages: 19 - 20
      Abstract: The editors of Inorganics would like to express their sincere gratitude to the following reviewers for assessing manuscripts in 2014:[...]
      PubDate: 2015-01-08
      DOI: 10.3390/inorganics3010019
      Issue No: Vol. 3, No. 1 (2015)
  • Inorganics, Vol. 3, Pages 21-26: A New Nanometer-Sized
           Ga(III)-Oxyhydroxide Cation

    • Authors: William Casey, Marilyn Olmstead, Caitlyn Hazlett, Chelsey Lamar, Tori Forbes
      Pages: 21 - 26
      Abstract: A new 30-center Ga(III)-oxy-hydroxide cation cluster was synthesized by hydrolysis of an aqueous GaCl3 solution near pH = 2.5 and crystallized using 2,6-napthalene disulfonate (NDS). The cluster has 30 metal centers and a nominal stoichiometry: [Ga30(μ4-O)12(μ3-O)4(μ3-OH)4(μ2-OH)42(H2O)16](2,6-NDS)6, where 2,6-NDS = 2,6-napthalene disulfonate This cluster augments the very small library of Group 13 clusters that have been isolated from aqueous solution and closely resembles one other Ga(III) cluster with 32 metal centers that had been isolated using curcurbit ligands. These clusters have uncommon linked Ga(O)4 centers and sets of both protonated and unprotonated μ3-oxo.
      PubDate: 2015-02-03
      DOI: 10.3390/inorganics3010021
      Issue No: Vol. 3, No. 1 (2015)
  • Inorganics, Vol. 3, Pages 27-39: [AuHg(o-C6H4PPh2)2I]: A Dinuclear
           Heterometallic Blue Emitter

    • Pages: 27 - 39
      Abstract: The heteronuclear AuI/HgII complex [AuHg(o-C6H4PPh2)2I] (1) was prepared by reacting of [Hg(2-C6H4PPh2)2] with [Au(tht)2]ClO4 (1:1) and NaI in excess. The heterometallic compound 1 has been structurally characterized and shows an unusual blue luminescent emission in the solid state. Theoretical calculations suggest that that the origin of the emission arises from the iodide ligand arriving at metal-based orbitals in a Ligand to Metal-Metal Charge Transfer transition.
      PubDate: 2015-02-11
      DOI: 10.3390/inorganics3010027
      Issue No: Vol. 3, No. 1 (2015)
  • Inorganics, Vol. 3, Pages 40-54: Disulfide Competition for Phosphine
           Gold(I) Thiolates: Phosphine Oxide Formation vs. Thiolate Disulfide

    • Authors: Gamage Garusinghe, S. Bessey, Mostapha Aghamoosa, Meaghan McKinnon, Alice Bruce, Mitchell Bruce
      Pages: 40 - 54
      Abstract: Phosphine gold(I) thiolate complexes react with aromatic disulfides via two pathways: either thiolate–disulfide exchange or a pathway that leads to formation of phosphine oxide. We have been investigating the mechanism of gold(I) thiolate–disulfide exchange. Since the formation of phosphine oxide is a competing reaction, it is important for our kinetic analysis to understand the conditions under which phosphine oxide forms. 1H and 31P{1H} NMR, and GC-MS techniques were employed to study the mechanism of formation of phosphine oxide in reactions of R3PAu(SRʹ) (R = Ph, Et; SRʹ = SC6H4CH3, SC6H4Cl, SC6H4NO2, or tetraacetylthioglucose (TATG)) and R*SSR* (SR* = SC6H4CH3, SC6H4Cl, SC6H4NO2, or 2-nitrobenzoic acid). The phosphine oxide pathway is most significant for disulfides with strongly electron withdrawing groups and in high dielectric solvents, such as DMSO. Data suggest that phosphine does not dissociate from gold(I) prior to reaction with disulfide. 2D (1H-1H) NMR ROESY experiments are consistent with an intermediate in which the disulfide and phosphine gold(I) thiolate are in close proximity. Water is necessary but not sufficient for formation of phosphine oxide since no phosphine oxide forms in acetonitrile, a solvent, which frequently contains water.
      PubDate: 2015-02-27
      DOI: 10.3390/inorganics3010040
      Issue No: Vol. 3, No. 1 (2015)
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