Synthesis, crystal structure, and properties of polymeric Rb{sub 12}Nb{sub 6}Se{sub 35}, a novel ternary niobium selenide consisting of infinite anionic chains built up by Nb{sub 2}Se{sub 11} units containing an uncommon Se{sub 3}{sup 4{minus}}-fragment
Journal Article
·
· Journal of Solid State Chemistry
- Univ. Kiel (Germany). Inst. fuer Anorganische Chemie
- Univ. Frankfurt (Germany). Inst. fuer Organische Chemie
Rb{sub 12}Nb{sub 6}Se{sub 35} is the first ternary niobium polyselenide composed of infinite anionic chains. These are well separated by rubidium cations. It crystallizes in the orthorhombic space group Pbcn with unit cell dimensions a = 8.5811(1) {angstrom}, b = 13.7152(1) {angstrom}, c = 56.5225(4) {angstrom}, and Z = 4. The least-squares refinement against F{sup 2} with anisotropic displacement parameters for all atoms yields R1 = 5.78 and wR2 = 12.81. The anionic polymeric chains are arranged in layers parallel to the (010) plane, and successive planes are rotated by 35{degree} against each other. Nb{sub 2}Se{sub 11} units composed of two face-sharing NbSe{sub 7} pentagonal bipyramids are the building blocks of the structure. They are interconnected by Se{sub 2}{sup 2{minus}} and Se{sub 3}{sup 2{minus}} polyanions, giving rise to infinite {sub {infinity}}{sup 1}[Nb{sub 6}Se{sub 35}]{sup 12{minus}} chains. Within the Nb{sub 2}Se{sub 11} units an unusual nearly linear Se{sub 3} fragment is found which must be formulated as Se{sub 3}{sup 4{minus}}.
- Sponsoring Organization:
- Deutsche Forschungsgemeinschaft, Bonn (Germany)
- OSTI ID:
- 305393
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 140; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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