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Synthesis Structure And Characterization Of Molybdenum And Rare Earth Chalcogenides
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Book Synopsis Synthesis, Structure and Characterization of Molybdenum and Rare Earth Chalcogenides by : Carmela Luisa Magliocchi
Download or read book Synthesis, Structure and Characterization of Molybdenum and Rare Earth Chalcogenides written by Carmela Luisa Magliocchi and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation focuses on the synthetic exploratory synthesis of molybdenum chalcogenides and rare earth metal-rich ternary tellurides as a part of an effort to produce molecular building blocks of molybdenum chalcogenide clusters and to explore their structural relationships with solid state cluster networks. The tightly cross-linked Mo3nSe3n+2(n = 2, 3 ... [infinity symbol] clusters and chain compounds react with alkali metal cyanide or cyanide salt mixtures at temperatures of 450-675 °C to yield reduced, cyanide-terminated molybdenum chalcogenide clusters that are thermodynamically stable. At temperatures of 650-675 °C, linear chain compounds M16[Mo6Se(CN)4(CN)2/2] (M1= K, Cs) were prepared from reactions of Mo6Se or elemental starting materials, Mo and Se with excess molten cyanide (KCN, CsCN). These are the first known compounds to feature linking of Mo6Se8 clusters via cyanide bridges. Magnetic susceptibility and EPR measurements indicate that there is one unpaired electron per cluster. A new reduced molecular octahedral complex, Na8[Mo6Se8(CN)6]·20H2O was prepared by the reduction of [Mo6Se8(CN)6]7- with Zn in an aqueous NaCN solution. Single crystal structure was determined. Cyclic voltammetric measurements in basic aqueous media show multiple reversible redox waves corresponding to [Mo6Se8(CN)6]6-/7-, [Mo6Se8(CN)6]7-/8-, [Mo6Se8(CN)6]8-/9- redox couples with half-wave potentials of E1/2 = -0.442 V, -0.876 V, and 11.369 V respectively versus the standard hydrogen electrode (SHE). UV-Vis studies support the presence of the reduced cluster compound. New reduced molecular tetrahedral complexes, K--Na[Mo4Se4(CN)12]·5H2O·MeOH, Na4Cs--[Mo4Se4(CN)12]Cl3, Na8[Mo4Se4(CN)12], and Na4K4[Mo4Se4(CN)12]·12H2O were prepared. Preparation of Na8[Mo4Se4(CN)12] is an improved method for the synthesis of the Mo4Se4 core. Half-wave potentials of E1/2 for the [Mo4Se4(CN)12]6-/7-and [Mo4Se4(CN)12]7-/8-couples are 0.233 V, and -0.422 V respectively versus SHE. The molecular cubane clusters [Mo4Se4(CN)12]7-/8-play an essential role in the process by which the discrete [Mo6Se8(CN)6]6-and [Mo6Se8(CN)6]7- are excised from the CN-linked chain compound, K6Mo6Se8(CN)5. A new rare-earth telluride compound with the empirical composition of Gd4NiTe2 was synthesized from a high-temperature solid-state reaction. Gd4MTe2 (M = Ni) crystallizes in the orthorhombic space group Pnma. This unprecedented structure consists of a cluster condensation of Ni-centered gadolinium tricapped trigonal prisms along the rectangular faces of the trigonal prism such that the Ni atoms act as two of the caps to the trigonal prisms.
Book Synopsis Synthesis, Structure and Characterization of Molybdenum and Rare Earth Chalcogenides by : Carmela Luisa Magliocchi
Download or read book Synthesis, Structure and Characterization of Molybdenum and Rare Earth Chalcogenides written by Carmela Luisa Magliocchi and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation focuses on the synthetic exploratory synthesis of molybdenum chalcogenides and rare earth metal-rich ternary tellurides as a part of an effort to produce molecular building blocks of molybdenum chalcogenide clusters and to explore their structural relationships with solid state cluster networks. The tightly cross-linked Mo3nSe3n+2(n = 2, 3 ... [infinity symbol] clusters and chain compounds react with alkali metal cyanide or cyanide salt mixtures at temperatures of 450-675 °C to yield reduced, cyanide-terminated molybdenum chalcogenide clusters that are thermodynamically stable. At temperatures of 650-675 °C, linear chain compounds M16[Mo6Se(CN)4(CN)2/2] (M1= K, Cs) were prepared from reactions of Mo6Se or elemental starting materials, Mo and Se with excess molten cyanide (KCN, CsCN). These are the first known compounds to feature linking of Mo6Se8 clusters via cyanide bridges. Magnetic susceptibility and EPR measurements indicate that there is one unpaired electron per cluster. A new reduced molecular octahedral complex, Na8[Mo6Se8(CN)6]·20H2O was prepared by the reduction of [Mo6Se8(CN)6]7- with Zn in an aqueous NaCN solution. Single crystal structure was determined. Cyclic voltammetric measurements in basic aqueous media show multiple reversible redox waves corresponding to [Mo6Se8(CN)6]6-/7-, [Mo6Se8(CN)6]7-/8-, [Mo6Se8(CN)6]8-/9- redox couples with half-wave potentials of E1/2 = -0.442 V, -0.876 V, and 11.369 V respectively versus the standard hydrogen electrode (SHE). UV-Vis studies support the presence of the reduced cluster compound. New reduced molecular tetrahedral complexes, K--Na[Mo4Se4(CN)12]·5H2O·MeOH, Na4Cs--[Mo4Se4(CN)12]Cl3, Na8[Mo4Se4(CN)12], and Na4K4[Mo4Se4(CN)12]·12H2O were prepared. Preparation of Na8[Mo4Se4(CN)12] is an improved method for the synthesis of the Mo4Se4 core. Half-wave potentials of E1/2 for the [Mo4Se4(CN)12]6-/7-and [Mo4Se4(CN)12]7-/8-couples are 0.233 V, and -0.422 V respectively versus SHE. The molecular cubane clusters [Mo4Se4(CN)12]7-/8-play an essential role in the process by which the discrete [Mo6Se8(CN)6]6-and [Mo6Se8(CN)6]7- are excised from the CN-linked chain compound, K6Mo6Se8(CN)5. A new rare-earth telluride compound with the empirical composition of Gd4NiTe2 was synthesized from a high-temperature solid-state reaction. Gd4MTe2 (M = Ni) crystallizes in the orthorhombic space group Pnma. This unprecedented structure consists of a cluster condensation of Ni-centered gadolinium tricapped trigonal prisms along the rectangular faces of the trigonal prism such that the Ni atoms act as two of the caps to the trigonal prisms.
Book Synopsis Synthesis and Characterization of Quaternary Group XIV and XV Rare-earth Chalcogenides by : Carl Richard Evenson
Download or read book Synthesis and Characterization of Quaternary Group XIV and XV Rare-earth Chalcogenides written by Carl Richard Evenson and published by . This book was released on 2001 with total page 816 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Bismuth and Rare-earth Chalcogenides by : Jiyong Yao
Download or read book Synthesis and Characterization of Bismuth and Rare-earth Chalcogenides written by Jiyong Yao and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: CsHo3Te5 and Cs3Tm11Te 18 were obtained as black needles. Each compound adopts a three-dimensional tunnel structure, with tunnels built from LnTe6 octahedra and filled with Cs atoms. The electronic structure of CsHo3Te5 was calculated. The direct band gap is estimated to be about 1.2 eV.
Book Synopsis Synthesis, Characterization, and Structure of Reduced Tungsten Chalcogenide Cluster Complexes by :
Download or read book Synthesis, Characterization, and Structure of Reduced Tungsten Chalcogenide Cluster Complexes written by and published by . This book was released on 1997 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Over the previous twenty years, ternary molybdenum chalcogenides of the general formula M(subscript x)Mo6Y (M = ternary metal cation; Y = chalcogenide), known as Chevrel phases, have been extensively studied. Many of these compounds have been found to have superconductivity, catalytic activity and ionic conductivity. The rich chemistry of the Chevrel phases raises considerable interest in finding the tungsten analogues of these phases. However, no such analogue has ever been synthesized, although the Chevrel phases are usually prepared directly from elements at high temperatures above 1000°C. The absence of the tungsten analogues may be caused by their thermodynamic instability at such high temperatures. Thus it might be necessary to avoid high-temperature synthetic procedures in order to establish the ternary and binary tungsten chalcogenides. A major focus of the McCarley research group has been on the preparation of M6YL6 (M = Mo, W; Y = S, Se, Te) cluster complexes as low temperature pathways to the Chevrel phases.
Book Synopsis Nanostructured Molybdenum Chalcogenides by : Gloria Alejandra Camacho Bragado
Download or read book Nanostructured Molybdenum Chalcogenides written by Gloria Alejandra Camacho Bragado and published by . This book was released on 2005 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bibliography written by Pierre Villars and published by Walter de Gruyter. This book was released on 2012-12-21 with total page 1827 pages. Available in PDF, EPUB and Kindle. Book excerpt: By browsing about 10 000 000 scientific articles of over 200 major journals mainly in a 'cover to cover approach' some 200 000 publications were selected. The extracted data is part of the following fundamental material research fields: crystal structures (S), phase diagrams (also called constitution) (C) and the comprehensive field of intrinsic physical properties (P). This work has been done systematically starting with the literature going back to 1900. The above mentioned research field codes (S, C, P) as well as the chemical systems investigated in each publication were included in the present work. The aim of the Inorganic Substances Bibliography is to provide researchers with a comprehensive compilation of all up to now published scientific publications on inorganic systems in only three handy volumes.
Book Synopsis Synthesis, Structure, and Characterization of New Ternary and Quaternary Chalcogenides from Supercritical Amine Systems by : James Emmett Jerome
Download or read book Synthesis, Structure, and Characterization of New Ternary and Quaternary Chalcogenides from Supercritical Amine Systems written by James Emmett Jerome and published by . This book was released on 1997 with total page 976 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Characterization of Rare Earth Doped Chalcogenide Glasses by : Kanxian Wei
Download or read book Synthesis and Characterization of Rare Earth Doped Chalcogenide Glasses written by Kanxian Wei and published by . This book was released on 1994 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis, Chemical and Structural Characterization of Molybdenum -hydrazido (2- ) Complexes with Tridentate Thiolate Ligands by : Lisa M. Throop
Download or read book Synthesis, Chemical and Structural Characterization of Molybdenum -hydrazido (2- ) Complexes with Tridentate Thiolate Ligands written by Lisa M. Throop and published by . This book was released on 1984 with total page 80 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Structural Characterization of New Multinary Group 15 (bismuth and Antimony) Chalcogenides by : Sumohan Misra
Download or read book Synthesis and Structural Characterization of New Multinary Group 15 (bismuth and Antimony) Chalcogenides written by Sumohan Misra and published by . This book was released on 2004 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Solid State Chemistry by : Aaron Wold
Download or read book Solid State Chemistry written by Aaron Wold and published by Springer Science & Business Media. This book was released on 1993-04-30 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: The subject matterofsolid state chemistry lies within the spheres ofboth physical and inorganic chemistry. In addition, there is a large overlap with solid state physics and materials engineering. However, solid state chemistry has still to be recognized by the general body ofchemists as a legitimate subfield ofchemistry. The discipline is not even well defined as to content and has many facets that make writing a textbook a formidable task. The early studies carried out in the United States by Roland Ward and his co workers emphasized the synthesisofnew materials and the determination oftheir structure. His work on doped alkaline earth sulfides formed the basis for the development of infrared phosphors and his pioneering studies on oxides were important in understanding the structural features of both the perovskite oxides as well as the magnetoplumbites. In 1945, A. F. Wells published the first edition of Structural Inorganic Chemistry. This work attempts to demonstrate that the synthesis, structure, and properties of solids form an important part of inorganic chemistry. Now, after almost 50 years during which many notable advances have been made in solid state chemistry, it is still evident that the synthesis, structure determination, and properties of solids receive little attention in most treatments of inorganic chemistry. The development of the field since the early studies of Roland Ward (early 1940s) has been rapid.
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2006 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis, Chemical and Structural Characterization of Complexes of Molybdenum with Sulfur and Nitrogen Containing Ligands by : Jeffrey Hyde (R.)
Download or read book Synthesis, Chemical and Structural Characterization of Complexes of Molybdenum with Sulfur and Nitrogen Containing Ligands written by Jeffrey Hyde (R.) and published by . This book was released on 1981 with total page 196 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis and Structural Characterization of Molybdenum and Tungsten Clusters Containing Sulphur by : Rosa Maria Llusar
Download or read book Synthesis and Structural Characterization of Molybdenum and Tungsten Clusters Containing Sulphur written by Rosa Maria Llusar and published by . This book was released on 1988 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Synthesis, Structural Characterization, and NMR Spectroscopy of Late Transition Metal and Main Group Chalcogenides by : Donna Marie Smith
Download or read book Synthesis, Structural Characterization, and NMR Spectroscopy of Late Transition Metal and Main Group Chalcogenides written by Donna Marie Smith and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The synthesis, characterization and spectroscopy of all the above compounds are discussed in the following pages.
Book Synopsis Synthesis, Characterization and Catalytic Activity of Molybdenum(VI) Di- and Monooxo Aryloxides by : Mauricio Quiroz-Guzmán
Download or read book Synthesis, Characterization and Catalytic Activity of Molybdenum(VI) Di- and Monooxo Aryloxides written by Mauricio Quiroz-Guzmán and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The chemistry of molybdenum is immensely rich and diverse. Molybdenum is essential for life, and has many applications in industry. The first chapter offers a general perspective of the chemistry of molybdenum in high oxidation states dominated by diverse oxo species, such as the MoO22+ and MoO4+ units that are focus of my research. I describe the importance of MoO22+ complexes as models for the active sites of oxo transfer molybdoenzymes (e.g. DMSO oxidase) and for industrial heterogeneous transformation such as the SOHIO process (one of our ultimate goals). I also outline the importance of MoO4+ complexes as procatalysts for metathesis polymerization and as models of deoxygenated active sites of MoO22+ oxygen catalysts that have triggered our interest. The second chapter introduces the synthesis and full characterization of 4-, 5- and 6-coordinated MoO2(OAr)2L0-1 complexes with bulky aryloxide ligands, starting from the MoO2Cl2 or MoO2Cl2(DMF)2 precursors. Steric and electronic modifications in the aryloxide moieties were performed in order to understand their effect in the final structure and yields of the synthesized complexes. The nature and mechanism of formation of the radical species detected in their synthesis is proposed. The third chapter presents the facile synthesis of varios MoO(OAr)4-nCln complexes starting from the MoO2Cl2 precursor. Their mechanism of formation is proposed and the supporting evidence for this new reaction is provided. Steric and electronic modifications in the aryloxide moieties were used to study their structural and electronic effects in the MoO4+ complexes. The fourth chapter outlines the synthesis of Mo(VI) monooxo bisphenoxides with a characteristic cis-chloro cis-bisphoxide arrangement around the MoO4+ unit. Electronic and steric modifications in the bisphenoxide rings were done to determine their effect in the structure and reactivity of the final complexes. The fifth chapter introduces the application of the synthesized MoO(OAr)4-nCln and MoO(bisphenoxides)2Cl2 complexes as procatalysts for olefin metathesis polymerization of norbornene. The correlation between structure and reactivity of the procatalyst is discussed.
