Disordering of the [NbOF5]2−complex anions in bis(glycinium) pentafluoridooxidoniobate(V) and bis(β-alaninium) pentafluoridooxidoniobate(V) dihydrate

Autor:	M. A. Pushilin, Ruven L. Davidovich, Andrey V. Gerasimenko
Rok vydání:	2008
Předmět:	Anions Models Molecular Alanine Molecular Structure Chemistry Hydrogen bond Niobium Glycine Oxides General Medicine Crystal structure Crystallography X-Ray General Biochemistry Genetics and Molecular Biology Bond length Crystallography beta-Alanine
Zdroj:	Acta Crystallographica Section C Crystal Structure Communications. 64:m358-m361
ISSN:	0108-2701
Popis:	The title compounds, (C(2)H(6)NO(2))(2)[NbOF(5)], (I), and (C(3)H(8)NO(2))(2)[NbOF(5)].2H(2)O, (II), are built from isolated distorted octahedral [NbOF(5)](2-) complex anions, amino acid cations and water molecules [for (II)]. In the pentafluoridooxidoniobate(V) anions, the Nb and O atoms, and the F atoms in trans positions with respect to the O atoms, are disordered about an inversion centre for both structures. The Nb atoms are shifted from the inversion centres by distances of 0.1455 (1) and 0.1263 (2) A for (I) and (II), respectively. The Nb=O and Nb-F(trans) bond lengths are 1.7952 (3) and 2.0862 (3) A, respectively, for (I), and 1.8037 (7) and 2.0556 (7) A for (II). In the crystal structures, cations and water molecules [for (II)] are linked to the [NbOF(5)](2-) anions via hydrogen bonds. This study demonstrates the possibility of true geometry determination of disordered [NbOF(5)](2-) complex anions in centrosymmetric structures.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e014424bb774d1d1ea4c58e2f156efaf https://doi.org/10.1107/s0108270108026413 Zobrazit plný text záznamu Plný text