Table of Contents
Metal-Based Drugs
Volume 6 (1999), Issue 4-5, Pages 211-221
http://dx.doi.org/10.1155/MBD.1999.211

Different Coordination Modes of a Tripod Phosphine in Gold(I) and Silver(I) Complexes

1Department of Inorganic Chemistry, University of Santiago de Compostela, Santiago de Compostela E-15706, Spain
2Department of Chemistry, University of Edinburgh King's Buildings, West Mains Road, Edinburgh EH9 3JJ, UK

Received 3 October 1998; Accepted 22 April 1999

Copyright © 1999 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

The following gold(I) and silver(I) complexes of the tritertiary phosphine 1,1,1- tris(diphenylphosphinomethyl)ethane, tripod , have been synthesised: Au3(tripod)X3 [X = Cl(1), Br(2), I(3)]; [Au3(tripod)2Cl2]Cl (4); Au(tripod)X [X = Br(5), I(6)]; Ag3(tripod)(NO3)3 (7), Ag(tripod)NO3 (8). They were characterized by X-ray diffraction (complexes 2, 3 and 4), P31 NMR spectroscopy, electrospray and FAB mass spectrometry and infrared spectroscopy. Complexes 2 and 3 show a linear coordination geometry for Au(I), with relatively short Au-P bond distances. Complex 3 has a Au•••Au intramolecular distance of 3.326 A° , while complex 2 had a short Au•••Au intermolecular interaction of 3.048 A° . Complexes 4-6 were found by P31 NMR spectroscopy studies to contain a mixture of species in solution, one of which crystallised as [Au3(tripod|)2Cl2]Cl which was shown by X-ray diffraction to contain both tetrahedral and linear Au(I), the first example of a Au(I) complex containing such a mixture of geometries. The reaction of [Au3(tripod)Cl3] (1) with tripod led successfully to the formation of [Au3(tripod)Cl3][Au3(tripod|)2Cl2]+ and [Au3(tripod|)3Cl]2+ . The silver(I) complexes, 7 and 8 appear to contain linear and tetrahedral Ag(I), respectively.