The Synthesis and Characterization of New Tantalum Chalcogenide Halide Cluster Compounds

The Synthesis and Characterization of New Tantalum Chalcogenide Halide Cluster Compounds
Author: Mark Douglas Smith
Publisher:
Total Pages: 404
Release: 1998
Genre:
ISBN:

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A family of new tantalum chalcogenide halide cluster compounds, Ta3QX-- (Q = S, Se, Te; X = Cl, Br, I), has been synthesized and characterized in an effort to extend the chemistry of this underdeveloped field. Ta3QX-- are closely structurally related to Nb3X, and represent the first Ta3 clusters to be obtained by traditional solid-state methods. Ta3QX-- are layered compounds featuring trinuclear Ta3 clusters interleaving close-packed mixed-anion layers. While Ta3QI-- (Q = S, Se, Te) and Ta3TeCl-- are isostructural with their niobium analogues, Ta3SBr-- adopts a new structure type closely related to Nb3SBr--. Investigation into the sulfide iodide system yielded three phases, including the novel mixed-valent disordered compound Ta4SI11, containing both Ta3 clusters and isolated Ta atoms. A mixed-metal study of the Nb[Subscript x]Ta3[Subscript x]TeI-- system (O [Less than or equal to] x [Less than or equal to] 3) indicates a structure type preference, depending on metal content.

The Chemistry of Vanadium, Niobium and Tantalum

The Chemistry of Vanadium, Niobium and Tantalum
Author: R. J. H. Clark
Publisher: Elsevier
Total Pages: 149
Release: 2013-10-08
Genre: Science
ISBN: 1483181707

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The Chemistry of Vanadium, Niobium and Tantalum gives a comprehensive discussion on the discovery, origin, and metallurgical aspects of vanadium, niobium, and tantalum. A section is also focused on the nuclear properties, as well as the physical and chemical properties of each compound. The history and distribution of vanadium, niobium, and tantalum are explored, along with the purification and extraction procedures of the said elements. The book also explores the derivative compounds such as the alloys, hydride, halides, and oxides. Another section of the book is focused on the physical and chemical modifications of the elements that generate such by-products as the cyanides, hydroxides, and sulfides. Different complexes of the elements such as halogeno- and oxyhalogeno-complexes are discussed in detail. The organometallic chemistry of niobium, tantalum, and vanadium are also identified. The book will be a useful tool for chemical engineers, chemical scientists, and students in the field of chemistry.