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Crystal Structures, Vibrational Spectra, and Normal Coordinate Analysis of cis- and trans-[ReCl

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Kristallstrukturen, Schwingungsspektren und Normalkoordinatenanalyse von cis- und trans-[ReCl

4

(NCSe)(SeCN)]

2-

Crystal Structures, Vibrational Spectra, and Normal Coordinate Analysis of cis- and trans-[ReCl

4

(NCSe)(SeCN)]

2

S. Strueß, W. Preetz*

Institut f¨ur Anorganische Chemie der Christian-Albrechts-Universit¨at, Olshausenstraße 40, D-24098 Kiel

Z. Naturforsch.54 b,357–362 (1999); eingegangen am 3. Dezember 1998 cis-Tetrachloroselenocyanato(N)-selenocyanato(Se)-rhenate(IV),

trans-Tetrachloroselenocyanato(N)-selenocyanato(Se)-rhenate(IV), Crystal Structure, Vibrational Spectra, Normal Coordinate Analysis

The crystal structures of cis-(n-Bu4N)2[ReCl4(NCSe)(SeCN)] (monoclinic, space group P 21/n a = 10.794(3), b = 11.687(3), c = 35.716(4) ˚A, = 96.97(1), Z = 4) and trans- (CH2Py2)[ReCl4(NCSe)(SeCN)] (monoclinic, space group P 21/c, a = 8.348(2), b = 7.518(1), c = 31.295(7) ˚A,= 97.12(2), Z = 4) have been determined by single crystal X-ray diffraction analysis. Based on the molecular parameters of the X-ray determinations the low temperature (10 K) IR and Raman spectra of the (n-Bu4N) salts have been assigned by normal coordinate analysis. The valence force constants are fd(ReN) = 1.68 and fd(ReSe) = 1.15 mdyn/ ˚A.

* Sonderdruckanforderungen an Prof. Dr. W. Preetz.

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