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Z. Naturforsch. 2013,
68b, 474 – 492
doi:10.5560/ZNB.2013-3040
Amine Complexes of Gold, Part 7: Pseudosymmetry in Amine Complexes of Gold(I) Cyanide
Aminkomplexe des Goldes, Teil 7: Pseudosymmetrie bei Aminkomplexen des Gold(I)-cyanids
Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Postfach 3329, D-38023 Braunschweig, Germany
Reprint requests to Prof. Dr. P. G. Jones. E-mail:
p.jones@tu-bs.de
Received February 11, 2013 / published online Juli 2, 2013
Professor Heinrich Nöth zum 85. Geburtstag gewidmet
The reaction between (tht)AuCl (tht = tetrahydrothiophene) and KCN leads to gold(I) cyanide. This can be treated with liquid amines or azaaromatics L to give crystalline molecular complexes LAuCN, the first complexes of the type (amine)cyanogold(I): L = cyclohexylamine, isobutylamine, isopropylamine, diethylamine, morpholine, piperidine, pyrrolidine, 2,4-lutidine, 3,5-lutidine, and 4-picoline. The cyclohexylamine complex was also obtained as the adduct LAuCN·L and the pyrrolidine complex in the ionic form [L2Au]+ [Au(CN)2]−. Two polymorphs of the 3,5-lutidine complex were obtained. Ethylenediamine gave the 2:1 complex L(AuCN)2. Several of the structures were difficult to refine because of
pseudosymmetry (e. g. polar axes). The packing diagrams were analyzed in terms of Au-Au contacts and N–H···N hydrogen bonds. As proof of the principle that the method is also suitable for other ligands, the complex with t-butyldiisopropylphosphane was synthesized and structurally characterized.
Key words: Gold, Cyanide, Amine, Secondary Interactions