TM7TM'6B8 (TM = Ta, Nb; TM' = Ru, Rh, Ir): new compounds with [B6] ring polyanions.
The ternary boron compounds TM(7)TM'(6)B(8) (TM = Ta, Nb; TM' = Ru, Rh, Ir) were prepared by high-temperature thermal treatment of mixtures of the elements. An analysis of the chemical bonding by the electron density/electron localizability approach reveals formation of covalently bonded polyanions [B(6)] and [TM'(6)B(2)]. The cationic part of the structure contains separated TM cations. In agreement with the chemical bonding analysis and band structure calculations, all TM(7)TM'(6)B(8) compounds are metallic Pauli-paramagnets (TM' = Ru, Rh) or diamagnets (TM' = Ir).
Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany.
Qiang
Q
Zheng
Miroslav
M
Kohout
Roman
R
Gumeniuk
Nikolay
N
Abramchuk
Horst
H
Borrmann
Yurii
Y
Prots
Ulrich
U
Burkhardt
Walter
W
Schnelle
Lev
L
Akselrud
Hui
H
Gu
Andreas
A
Leithe-Jasper
Yuri
Y
Grin