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2005
Structure
D 2000
20- 007
Tetracyanoborate Salts M[B(CN)4] with M = Singly Charged Cations: Properties
and Structures. — The single crystal X-ray structures, vibrational spectra, solubilities
in water, and thermal stabilities of (III), (V), and (VIII) are determined and compared
with already known M[B(CN)4] salts. (Ib) crystallizes in the cubic space group Fd3m
with Z = 8, (IIIa) and (VIII) in the cubic space group P43m with Z = 1, (IIIb), (V),
Cs[B(CN)4], and NH4[B(CN)4] in the tetragonal space group I41/a with Z = 4, and the
THF adducts Na[B(CN)4]·THF and NH4[B(CN)4]·THF in the orthorhombic space
group Pnma with Z = 4. The latter two phases are not isostructural. The cubic structures
of the Li+, Na+, and Cu+ salts consist of two interpenetrating independent tetrahedral
networks of M+ cations and [B(CN)4]- ions. In the vibrational spectra the two CN
stretching modes A1 and T2 coincide in general and the band positions are a measure
for the strength of the interionic interaction. An interesting feature in the Raman spectrum of the copper salt is the first appearance of two CN stretching modes. —
(KUEPPERS, T.; BERNHARDT, E.; WILLNER*, H.; ROHM, H. W.;
KOECKERLING, M.; Inorg. Chem. 44 (2005) 4, 1015-1022; Fachbereich 9, Anorg.
Chem., Bergische Univ.-GH, D-42097 Wuppertal, Germany; Eng.) — Schramke
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