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  Vibrational spectra of cluster anions. 2. Vibrational spectra of compounds with the cluster anions [E4]4- : M4E4 (M = K, Rb, Cs; E = Ge, Sn) and β-Na4Sn4

Somer, M., Aydemir, U., Baitinger, M., & von Schnering, H. G. (2006). Vibrational spectra of cluster anions. 2. Vibrational spectra of compounds with the cluster anions [E4]4-: M4E4 (M = K, Rb, Cs; E = Ge, Sn) and β-Na4Sn4. Zeitschrift für anorganische und allgemeine Chemie, 632(7), 1281-1286.

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 Creators:
Somer, M.1, Author           
Aydemir, U., Author
Baitinger, M.1, Author           
von Schnering, H. G.1, Author           
Affiliations:
1Former Departments, Max Planck Institute for Solid State Research, Max Planck Society, ou_3370502              

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Free keywords: germanium; tin; Zintl phases; Zintl ions; cluster anions; hetero-tetrahedranide anions; vibrational spectra; force constants
 Abstract: Vibrational spectra of the compounds M4E4 (M = K, Rb, Cs; E = Ge, Sn)
and of beta-Na4Sn4 with the cluster anions [E-4](4-) were analysed
based on the point group (4) over bar 3m-T-d of isolated tetrahedranide
units. The lower individual (4) over bar 2m-D-2d symmetry of the anions
in the real structure being more patterned and complex primarily
affects the spectra of the tetrahedro-tetragermanides. nu(3)(F-2)
clearly splits both in Raman and IR and in the case of K4Sn4 only in
JR. Rb4Sn4 and Cs4Sn4 exhibit very simple spectra with three bands in
Raman and one band in JR. The breathing mode nu(1)(A(1)) for the quasi
isolated [E-4](4-) cluster appears only in the Raman spectrum and is
hardly influenced by the structural environment and by the nature of
the alkali metal cations: nu(1)(A(1)) = 274 cm(-1) ([Ge-4](4-)) and
183-187 cm(-1) ([Sn-4](4-)), respectively. The calculated valence force
constants fd(E-E) are: [Ge-4](4-): f(d) = 0.89 Ncm(-1) (K), 0.87
Ncm(-1) (Rb), 0.86 Ncm(-1) (Cs) and [Sn-4](4-): 0.67 Ncm(-1) (Na), 0.66
Ncm(-1) (K), 0.67 Ncm(-1) (Rb), 0.68 Ncm(-1) (Cs). Both, the
frequencies and the force constants fit well into the range previously
reported.

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Language(s): eng - English
 Dates: 2006
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 305990
ISI: 000238340900024
 Degree: -

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Title: Zeitschrift für anorganische und allgemeine Chemie
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: -
Pages: - Volume / Issue: 632 (7) Sequence Number: - Start / End Page: 1281 - 1286 Identifier: ISSN: 0044-2313