| Abstract
| - The substitution of μ-acetato ligands in cis-Re2(μ-O2CCH3)2Cl2(μ-dppm)2 (dppm = Ph2PCH2PPh2) and trans-Re2(μ-O2CCH3)2Cl2(μ-dppE)2 (dppE = Ph2PC(CH2)PPh2) by [4-Ph2PC6H4CO2]- occurs with retention of stereochemistry to give complexes in which the uncoordinated phosphine groups can be used to synthesize small mixed-metal assemblies. Examples include the tweezer complex cis-Re2(μ-O2CC6H4-4-PPh2)2Cl2(μ-dppm)2(Pd2Cl4) (5) in which the planar [(P)ClPd(μ-Cl2)PdCl(P)] unit has the unusual cis structure.
- The substitution of the μ-acetato ligands in cis-Re2(μ-O2CCH3)2Cl2(μ-dppm)2 (1, dppm = Ph2PCH2PPh2) and trans-Re2(μ-O2CCH3)2Cl2(μ-dppE)2 (2, dppE = Ph2PC(CH2)PPh2) by [4-Ph2PC6H4CO2]- occurs with retention of stereochemistry to give cis-Re2(μ-O2CC6H4-4-PPh2)2Cl2(μ-dppm)2 (3) and trans-Re2(μ-O2CC6H4-4-PPh2)2Cl2(μ-dppE)2 (6), respectively. The uncoordinated phosphinegroups in complexes 3 and 6 have been used to form mixed-metal assemblies with Au(I) and Pd(II), including the Re2Pd2complex cis-Re2(μ-O2CC6H4-4-PPh2)2Cl2(μ-dppm)2(Pd2Cl4) (5), inwhich the planar [(P)ClPd(μ-Cl)2PdCl(P)] unit has the unusual cisstructure. The crystal structures of 3 and 5 have been determined.
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