Premium
Re‐evaluation of the X‐ray Crystal Structure of [Ta 4 F 20 ] and the Synthesis and Characterization of a Series of Mixed‐Metal Pentafluorides of Niobium and Tantalum
Author(s) -
Brewer Stuart A.,
Brisdon Alan K.,
Fawcett John,
Holliman Peter J.,
Holloway John H.,
Hope Eric G.,
Russell David R.
Publication year - 2006
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/zaac.200500374
Subject(s) - tantalum , isostructural , niobium , crystallography , monoclinic crystal system , octahedron , crystal structure , x ray , metal , materials science , chemistry , metallurgy , physics , optics
The direct fluorination of intimately mixed niobium and tantalum powders gives a range of mixed‐metal pentafluorides [Nb x Ta 4‐x F 20 ] (x = 1 2 , 2 3 , 3 4 ) as discreet species isostructural with tantalum pentafluoride (x = 0 1 ). The crystal structures of 1–4 are indistinguishable by X‐ray crystallography. Complex 1 crystallizes in the monoclinic space group C2/m with a = 9.5462(13), b = 14.3578(19), c = 5.0174(7) Å, β = 97.086(2)°, Z = 2. The geometry about the tantalum atom is distorted octahedral with 2 short and 2 slightly longer Ta‐F terminal , and 2 Ta‐F bridging distances. The angles at the bridging fluorine atoms are 172.9(5)°.