Bis(dimethylphosphino)methane (dmpm) complexes of iron,molybdenum and chromium: X-ray crystal structures of FeCr(CO)6(μ-dmpm)2 and Fe2(CO)4(μ-CO)(μ-dmpm)2 |
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| Authors: | Wai Kwok Wong Kwok W Chiu Geoffrey Wilkinson Majid Motevalli Michael B Hursthouse |
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| Institution: | Chemistry Department, Imperial College, London SW7 2AY, U.K.;Chemistry Department, Queen Mary College, Mile End Road, London E1 4NS, U.K. |
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| Abstract: | The photolysis of Fe(η1-dmpm)(dmpm)2 dmpm = bis(dimethylphosphino) methane) with Cr(CO)6 and Fe(CO)5 under UV irradiation produces FeCr(CO)6(μ-dmpm)2, Fe2(CO)6(μ-CO)(μ-dmpm) and Fe2(CO)4(μ-CO)(μ-dmpm)2 respectively. The interaction of Mo(CO)3(MeCN)3 and (C7H8)Cr(CO)3 with dmpm produces Mo2(CO)6(μ-dmpm)3 and cis-Cr(CO)2(dmpm)2 respectively. The X-ray crystal structure of FeCr(CO)6(μ-dmpm)2 shows the molecule to contain a trigonal bipyramidal Fe(CO)3P2 unit plus a square pyramidal Cr(CO)3P2 unit held closely together by the methylene bridges of the dmpm ligands with steric compression between the CO groups causing distortions from ideal geometry in each case. The Cr … Fe distance is 3.111(6) Å and there seems to be little structural evidence of any form of interaction between the 16e Cr(O) centre and the Fe-containing unit. The structure of Fe2(CO)4(μ-CO)(μ-dmpm)2 contains a symmetrical μ2-carbonyl and a single bond between the two symmetry related (m) iron atoms. The Fe … Fe distance is 2.719(4) Å. |
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| Keywords: | Authors to whom all correspondence should be addressed |
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