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Kristallstrukturen und Normalkoordinatenanalyse von trans-(n-Bu

4

N)

2

[ReCl

4

IX], X = NCS, NCSe

Crystal Structures and Normal Coordinate Analyses of trans-(n-Bu

4

N)

2

[ReCl

4

IX], X = NCS, NCSe

L. Homolya, S. Strueß und W. Preetz*

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

* Sonderdruckanforderungen an Prof. Dr. W. Preetz. Fax: +49 431 880 1520.

Z. Naturforsch.54 b,767–771 (1999); eingegangen am 11. Februar 1999 trans-Tetrachloromonoiodothiocyanato(N)-rhenate(IV), trans-Tetrachloro- monoiodoselenocyanato(N)-rhenate(IV),

Crystal Structure, Normal Coordinate Analysis

The crystal structures of trans-(n-Bu4N)2[ReCl4I(NCS)] (triclinic, space group P¯1, a = 11.268(3), b = 11.696(2), c = 18.109(3) ˚A, = 98.68(2) = 106.40(2), = 97.58(2), Z = 2) and trans-(n-Bu4N)2[ReCl4I(NCSe)] (orthorhombic, space group P 212121, a = 11.839(2), b = 12.2679(10), c = 31.136(5) ˚A, 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) = 1.69(NCS) and 1.65(NCSe) mdyn/ ˚A.

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