Solid state polyselenides and polytellurides: a large variety of Se-Se and Te-Te interactions

A large variety of different interactions between the chalcogen atoms, Q, occur in the solid state structures of polyselenides and polytellurides, including both molecular and infinite units. The simplest motifs are classical Q(2)(2-) dumbbells and nonlinear Q(n)(2-) chains (n = 3, 4, 5, ..), e.g. f...

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Published inMolecules Vol. 14; no. 9; pp. 3115 - 3131
Main Authors Graf, Christian, Assoud, Abdeljalil, Mayasree, Oottil, Kleinke, Holger
Format Journal Article Book Review
LanguageEnglish
Published Switzerland MDPI AG 24.08.2009
Molecular Diversity Preservation International
Subjects
bonding
hypervalent
Molecular Conformation
Review
selenium
Selenium - chemistry
Selenium Compounds - chemistry
tellurium
Tellurium - chemistry
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Summary:A large variety of different interactions between the chalcogen atoms, Q, occur in the solid state structures of polyselenides and polytellurides, including both molecular and infinite units. The simplest motifs are classical Q(2)(2-) dumbbells and nonlinear Q(n)(2-) chains (n = 3, 4, 5, ..), e.g. found in alkali metal polychalcogenides. In addition, nonclassical so-called hypervalent motifs exist in the form of linear Q(3)(4-) units or within larger units such as Q(4)(4-) and Q(5)(4-). Infinitely extended Q units include zigzag, cis/trans and linear chains, as well as planar and slightly puckered layers. Several of those are susceptible to Peierls distortions, leading to the formation of both commensurate and incommensurate superstructures and anomalies in transport properties, including metal-nonmetal transitions.
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ISSN:1420-3049
1420-3049
DOI:10.3390/molecules14093115