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Na 0.74 Ta 3 O 6 , ein niedervalentes Oxotantalat mit einer Ta–Ta‐Mehrfachbindung
Author(s) -
Harbrecht B.,
Ritter A.
Publication year - 1999
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/(sici)1521-3749(199902)625:2<178::aid-zaac178>3.0.co;2-r
Subject(s) - tantalum , crystallography , crystal structure , chemistry , propellane , stereochemistry , materials science , bicyclic molecule , organic chemistry
Na 0.74 Ta 3 O 6 , a Low‐Valent Oxotantalate with Multiple Ta–Ta Bonds The title compound was prepared in a sealed tantalum tube through the reaction of Ta 2 O 5 , tantalum and Na 2 CO 3 in a NaCl flux at 1570 K within 5 d. The crystal structure of Na 0.74 Ta 3 O 6 (a = 713.5(1), b = 1027.4(2), c = 639.9(1) pm, Immm, Z = 4) was determined by single crystal X‐ray means. The structure is isomorphous with NaNb 3 O 5 F [1]. The characteristic structural units are triply bonded Ta1 2 dumb‐bells with eight square‐prismatically co‐ordinated O ligands. Four Ta2, each octahedrally surrounded by O atoms, are side‐on bonded weakly to the binuclear Ta 2 O 8 complex, thus forming a Ta 6 propellane‐like cluster. The lattice parameters of three additional M x Ta 3 O 6 phases, M = Li, Mn, and Yb, are reported.