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Cis- and trans-Bis(1-phenyl-2,3,4,5-tetramethylphosphole)tetracarbonylmolybdenum(0), [Mo(CO)4(tmpPh)2]. Syntheses and structures

Abstract : 1-Phenyl-2,3,4,5-tetramethylphosphole reacts with [Mo(CO)6] to give the mono- and bis(phosphole) complexes [Mo(CO)5L] and cis- and trans-[Mo(CO)4L2], where L=C4Me4PPh (tmpPh). The new complexes have been characterised by spectroscopic methods, supplemented by single-crystal X-ray analyses in the case of the bis(phosphole) isomers. The isomeric bis-tmpPh complexes show little evidence of the overcrowding which is thought to lengthen bonds and distort the metal coordination in the corresponding bis-PPh3 and bis-PCy3 isomers. The structural basis for the greater stability of the trans isomers is briefly considered: the cis→trans isomerisation typically involves little change in the mean Mo-CO distance, whereas there is a marked shortening of the Mo-P bonds. © 2001 Elsevier Science B.V.
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https://hal.univ-brest.fr/hal-01770130
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Submitted on : Wednesday, April 18, 2018 - 4:15:40 PM
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K.W. Muir, François Pétillon, R. Rumin, Philippe Schollhammer, J. Talarmin. Cis- and trans-Bis(1-phenyl-2,3,4,5-tetramethylphosphole)tetracarbonylmolybdenum(0), [Mo(CO)4(tmpPh)2]. Syntheses and structures. Journal of Organometallic Chemistry, Elsevier, 2001, 622 (1-2), pp.297-301. ⟨10.1016/S0022-328X(00)00874-3⟩. ⟨hal-01770130⟩

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