Abstract
Reduction of the mixed-metal octanuclear cluster [Os6(CO)17(Au2dppm)] (1) with Na-Hg amalgam and subsequent reaction with one equivalent of [Au2dppm][NO3] affords two isomers of the neutral decanuclear cluster [Os6(CO)17(Au2dppm)2] (2a, 2b). In a similar reaction between the reduced form of 1 with two equivalents of [AuPPh3][NO3] gives two isomers of the related cluster [Os6(CO)17(Au2dppm2)(AuPPh 3)2] (3a, 3b). All the new clusters have been characterised by IR and NMR spectroscopy and FAB mass spectrometry. The molecular and crystal structure of 2a has been established by a single-crystal X-ray structure. In 2a the six Os atoms define an octahedron, in contrast to the bicapped tetrahedral osmium core previously observed for 1. Two of the Au atoms in 2a cap adjacent triangular faces of the Os6 octahedron while the third spans an open OsAu2 triangle, and the fourth caps a closed OsAu2 triangle. Overall the decametal core may be viewed as an octahedron fused with a capped square based pyramid.
Original language | English |
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Pages (from-to) | 231-237 |
Number of pages | 7 |
Journal | Journal of Organometallic Chemistry |
Volume | 614-615 |
DOIs | |
Publication status | Published - 8 Dec 2000 |
Funding
We gratefully acknowledge the Cambridge Commonwealth Trust and the UK Committee of Vice Chancellors and Principals (Z.A.), the Engineering and Physical Sciences Research Council (G.P.S.), the Cambridge Crystallographic Data Centre (G.P.S.), and the European Union (J.F.G.) for financial support. We also thank the EPSRC for funding for the purchase of X-ray equipment and Johnson Matthey plc for the generous loan of osmium salts.
Keywords
- Carbonyl cluster
- Gold
- Ionic coupling
- Osmium
- X-ray structure
ASJC Scopus subject areas
- Biochemistry
- Physical and Theoretical Chemistry
- Organic Chemistry
- Inorganic Chemistry
- Materials Chemistry