ISSN:
0377-0486
Keywords:
Chemistry
;
Analytical Chemistry and Spectroscopy
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
,
Physics
Notes:
The FT-IR and micro-Raman spectra of the solid Group IVB and VIB metallacyclo-sulfanes and -selenanes, Cp2ME5 (Cp = η-C5H5; M = Ti, Zr, Hf; E = S, Se), (η-C5Me5)2MS3, Cp2MS4 (M = Mo, W) and Cp2MoS2 have been recorded and assignments are presented for the cyclopentadienyl ligand vibrations and some of the low-energy modes associated with the metal-chalcogen moieties. This is the first time that attempts have been made to identify the Zr—S, Hf—S, Ti—Se, Zr—Se, and Hf—Se stretching modes in such metal chelates. For the polysulfane complexes, the peaks attributed to the symmetric ν(S—S) stretching modes decrease in energy with increasing size of the catenated metal-sulfur ring and so it appears that vibrational spectroscopy can be used to distinguish between the four different ring sizes. For the polyselenanes, an empirical relationship (similar to that already known for S-S vibrations) relating the wavenumber of the symmetric ν(Se—Se) stretch and the Se-Se bond length is proposed.
Additional Material:
2 Ill.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1002/jrs.1250170212
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