The ReH6[P(C6H5)3]2 ion as a ligand: complexes with M(CO)3 fragments (M = Cr, Mo, W) |
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| Authors: | Jeffrey W Freeman Atta M Arif Richard D Ernst |
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| Institution: | Department of Chemistry, University of Utah, Salt Lake City, UT 84112, USA |
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| Abstract: | The reactions of (H5C6)3P]2ReH6? with (CH3CN)3Cr(CO)3, (diglyme)Mo(CO)3 or (C3H7CN)3W(CO)3 led to the formation of (H5C6)3P]2ReH6M(CO)3? (M = Cr, Mo, W) complexes. These have been characterized by IR and NMR spectroscopies, as well as elemental analyses. A single crystal X-ray diffraction study has also been carried out for the M = Cr complex as a K(18-crown-6)+ salt. The complex crystallizes as a THF monosolvate in the monoclinic space group P21/n with a = 22.323(6), B = 9.523(2), C = 27.502(5) Å, β = 104.98(2)0 and V = 5648 Å3 for Z = 4. The Re---Cr separation is 2.5745(12) Å, and the two phosphine ligands are oriented unsymmetrically. Although the hydride ligands were not found, the presence of three bridging hydrides and a dodecahedral coordination geometry about rhenium could be inferred. Low temperature 1H and 31P NMR spectroscopic studies did not reveal the low symmetry of the solid state structure. |
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| Keywords: | Crystal structures Rhenium complexes Polyhydride complexes Chromium complexes Molybdenum complexes Tungsten complexes Carbonyl complexes |
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