Rb{sub 2}BaNb{sub 2}Se{sub 11}: A new quaternary niobium polyselenide with infinite anionic chains composed of Nb{sub 2}Se{sub 11} building block
Journal Article
·
· Journal of Solid State Chemistry
OSTI ID:21015626
- Institut fuer Anorganische Chemie, Christian-Albrechts-Universitaet zu Kiel, Olshausenstr. 40, D-24108 Kiel (Germany)
The quaternary compound Rb{sub 2}BaNb{sub 2}Se{sub 11} has been synthesized by reacting Nb metal with an in situ formed flux of Rb{sub 2}Se{sub 3}, BaSe and Se at 773 K. Rb{sub 2}BaNb{sub 2}Se{sub 11} crystallizes in the monoclinic space group P2{sub 1}/c with four formula units and lattice parameters a=7.8438(5) A, b=13.6959(6) A, c=17.0677(13) A, {beta}=97.917(9){sup o}. The structure consists of one-dimensional anionic chains formed by interconnection of dimeric [Nb{sub 2}Se{sub 11}] units. The chains are directed along the crystallographic c-axis with Rb{sup +} and Ba{sup 2+} ions being located between the chains. The [Nb{sub 2}Se{sub 11}] units are formed by face sharing of two NbSe{sub 7} bipyramids and are joined by Se{sub 2} {sup 2-} dianions to form infinite {sup 1} {sub {infinity}}[Nb{sub 2}Se{sub 11} {sup 4-}] chains. The compound was characterized with infrared spectroscopy in the FIR region, Raman and UV/Vis diffuse reflectance spectroscopy. - Graphical abstract: The {sup 1} {sub {infinity}}[Nb{sub 2}Se{sub 11}]{sup 4-} chain in the new mixed group1/group2 polyselenide compound Rb{sub 2}BaNb{sub 2}Se{sub 11} is formed by interconnection of [Nb{sub 2}Se{sub 11}] units via Se{sub 2} {sup 2-} dianions. The [Nb{sub 2}Se{sub 11}] building blocks are formed by face sharing of two distorted pentagonal bipyramidal NbSe{sub 7} groups.
- OSTI ID:
- 21015626
- Journal Information:
- Journal of Solid State Chemistry, Journal Name: Journal of Solid State Chemistry Journal Issue: 1 Vol. 180; ISSN 0022-4596; ISSN JSSCBI
- Country of Publication:
- United States
- Language:
- English
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