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Sulfide Clusters (sulfide + cluster)
Selected AbstractsCharacterization of "Cd10S4(SPh)12", the Thermal Decomposition Product of (NMe4)4[Cd10S4(SPh)16]: Synthesis of a Neutral Cd54 Sulfide Cluster and of a Polymeric Chain of Thiolate-Bridged Cd17 Sulfide ClustersEUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 21 2010Maria Bendova Abstract Contrary to claims in the literature that a cluster of the composition of "Cd10S4(SPh)12" was formed by thermal treatment of (NMe4)4[Cd10S4(SPh)16], experimental evidence was gathered that the core structure of the cluster is not exclusively retained and other CdS species are also formed. When "Cd10S4(SPh)12" was treated with PhSH/NEt3 only a part of the material was converted into (NHEt3)4[Cd10S4(SPh)16]. From solutions of "Cd10S4(SPh)12" in strongly coordinating solvents the new neutral CdS clusters Cd54S28(SPh)52Lx (L = pyridine, DMSO or DMF) and [Cd17S4(SPh)26py], were crystallized. The latter forms polymeric chains of phenylthiolate-bridged Cd17 units. [source] Structures and Infrared Spectra of Fluoride,Hydrogen Sulfide Clusters from ab initio Calculations: F - -(H2S)n, n = 1,5CHEMINFORM, Issue 3 2006D. A. Wild Abstract For Abstract see ChemInform Abstract in Full Text. [source] Density Functional Study of the Structures of Lead Sulfide Clusters (PbS)n (n = 1,9).CHEMINFORM, Issue 21 2005Hongxia Zeng No abstract is available for this article. [source] Monolayers of Zeolite A Containing Luminescent Silver Sulfide ClustersCHEMPHYSCHEM, Issue 10 2004Claudia Leiggener Clustered crystals: The authors demonstrate formation of stable zeolite A monolayers on quartz and subsequent "ship-in-a-bottle" synthesis of luminescent silver sulfide clusters. The pictures show the zeolite crystals at various stages of this process. [source] Crystallization and crystallographic analysis of the apo form of the orange protein (ORP) from Desulfovibrio gigasACTA CRYSTALLOGRAPHICA SECTION F (ELECTRONIC), Issue 7 2009Shabir Najmudin The orange-coloured protein (ORP) from Desulfovibrio gigas is a 12,kDa protein that contains a novel mixed-metal sulfide cluster of the type [S2MoS2CuS2MoS2]. Diffracting crystals of the apo form of ORP have been obtained. Data have been collected for the apo form of ORP to 2.25,Å resolution in-house and to beyond 2.0,Å resolution at ESRF, Grenoble. The crystals belonged to a trigonal space group, with unit-cell parameters a = 43, b = 43, c = 106,Å. [source] Synthesis and characterization of metal sulfide clusters for toxicological studiesENVIRONMENTAL TOXICOLOGY & CHEMISTRY, Issue 4 2002Karl C. Bowles Abstract Zinc sulfide clusters were synthesized and characterized at low micromolar concentrations to assess the effect of metal-sulfide ligands on metal toxicity to aquatic organisms in oxic environments. Recommended preparation times are greater than 2 h initial reaction of equimolar sodium sulfide and zinc nitrate, followed by oxic aeration for 3 d. Ionic strength, pH, and anoxic stabilization time were found to be relatively unimportant in controlling the final yield. Adsorptive losses of zinc sulfide (ZnS) clusters to surfaces, however, were significant for a variety of vessel materials and membrane filters. Ionic strength and pH were found to be important factors controlling the extent of adsorptive losses with minimal loss for pHs greater than 9 and for soft waters. The Ag(I), Cu(II), and Hg(II) as metal sulfides completely suppress the analysis of sulfide, whereas Pb(II), Mn(II), and Co(II) partially suppress the analysis of sulfide by the methylene blue technique. Ultraviolet and fluorescence spectra are shown for synthesized ZnS clusters. [source] Studies on the Formation of CdS Nanoparticles from Solutions of (NMe4)4[Cd10S4(SPh)16]EUROPEAN JOURNAL OF INORGANIC CHEMISTRY, Issue 15 2010Maria Bendova Abstract The stepwise cluster growth, and formation of CdS nanoparticles from solutions of (NMe4)4[Cd10S4(SPh)16] in dimethyl sulfoxide (DMSO), dimethylformamide (DMF) and acetonitrile was investigated. Cluster growth is fast in DMSO and DMF at room temperature, and slow in acetonitrile at elevated temperatures. Larger sulfide clusters (initially Cd32, then Cd54) are initially formed, which upon further growth eventually give rise to CdS nanoparticles. Strong evidence was found that the byproduct formed during the reaction in DMSO is mononuclear [Cd(SPh)x(DMSO)y](2,x) (x , 3). [source] Characterization of the active site structure of Pd and Pd-promoted Mo sulfide catalysts by means of XAFSJOURNAL OF SYNCHROTRON RADIATION, Issue 2 2001Takeshi Kubota Recently, noble metal catalysts are noted as promising candidates for new super-deep-hydrodesulfurization (HDS) catalysts. In this study, we investigated the structure of Pd particles supported on zeolite and Al2O3 under a sulfidation or reduction condition. From EXAFS analysis, it was found for sulfided Pd catalysts that small Pd sulfide clusters are formed without sintering. It was also revealed that no extensive growth of metal Pd particles occurs in Pd/NaY sulfide catalysts even after a treatment with H2 at 673 K. The dispersion of Pd metal particles is improved by H2/H2S treatment. These results indicate that in the presence of H2S, Pd shows high resistance against particle growth. A comparison of the Mo and Pd K-edge EXAFS spectra for MoSx/Pd-NaY and Pd-NaY catalysts revealed the existence of Mo-Pd bondings by the addition of Mo sulfide, indicating a direct interaction between Mo and Pd sulfides. [source] Transition metal sulfide clusters below the cluster,platelet transition: Theory and experimentPHYSICA STATUS SOLIDI (B) BASIC SOLID STATE PHYSICS, Issue 5 2010Sibylle Gemming Abstract The structural and electronic properties of neutral and anionic molybdenum sulfide clusters with the composition Mo3Sn (n,=,0,12) were studied by density-functional calculations. The theoretical results are confirmed by a comparison with photoelectron spectra of the corresponding W3S anions providing experimental values for the vertical detachment energies (VDEs) and the highest occupied (HOMO) and lowest unoccupied (LUMO) gaps. For sulfur contents up to n,=,9 the clusters are composed of a central Mo3 unit, which is decorated by bridging, terminal, and three-fold coordinated S atoms. For n,>,9, a cleavage of the Mo3 center is observed. The formation of disulfide like ions is found for Mo3S9 and larger species. In accordance with investigations of MoSn, Mo2Sn, and Mo4Sn clusters, the heat of formation and the VDE reaches a maximum in the sulfur-rich region beyond the composition Mo:S,=,1:2. [source] Monolayers of Zeolite A Containing Luminescent Silver Sulfide ClustersCHEMPHYSCHEM, Issue 10 2004Claudia Leiggener Clustered crystals: The authors demonstrate formation of stable zeolite A monolayers on quartz and subsequent "ship-in-a-bottle" synthesis of luminescent silver sulfide clusters. The pictures show the zeolite crystals at various stages of this process. [source] | ||||||||||