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The crystal structures of cis-(n-Bu 4 N) 2 [ReBr 4 (NCS)(SCN)] (1) (monoclinic, space group P2 1 /n, a = 11.203(3), b = 11.738(5), c = 35.218(7) Å, β = 93.434(4)°, Z = 4), trans-(n-Bu 4 N) 2 [ReBr 4 (NCS)(SCN)] (2) (monoclinic, space group P2 1 /n, a = 11.644(7), b = 13.695(3), c = 29.028(8) Å, β = 95.96(4)° Z = 4) and trans-(n-Bu 4 N) 2 [ReBr 4 (NCSe)(SeCN)] (3) (monoclinic, space group P2 1 /n, a = 11.894(2), b = 13.737(2), c = 28.869(7) Å, β = 96.98(10)° Z = 4) have been determined by single crystal X-ray diffraction analysis. Based on these molecular parameters the low temperature (10 K) IR and Raman spectra of the (n-Bu 4 N) salts have been assigned by normal coordinate analysis. The valence force constants are f d (ReN) = 1.70 (1), 1.75 (2) and 1.75 (3), f d (ReS) = 1.32 (1) and 1.37 (2) and f d (ReSe) = 1.20 mdyn/Å (3).

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Kristallstrukturen, Schwingungsspektren und Normalkoordinatenanalyse von cis-(n-Bu 4 N) 2 [ReBr 4 (NCS)(SCN)], trans-(n-Bu 4 N) 2 [ReBr 4 (NCS)(SCN)] und trans-(n-Bu 4 N) 2 [ReBr 4 (NCSe)(SeCN)]