σ-Alkynyl complexes of manganese(I) as η2-bonding ligands for Group 1B metal–ligand fragments. X-Ray crystal structure of [Mn2Cu(µ-CCBut)2(CO)6(dppe)2]PF6·0.5CH2Cl2
Abstract
Several compounds of the types [MnML(µ-CCR)(CO)3(dppe)]n+{ML = CuCl (n= 0), Au(C6F5)(n= 0), or M[P(C6H4Me-2)3](n= 1; M = Cu, Ag, or Au); R = CH2OMe, But, or Ph; dppe = Ph2PCH2CH2PPh2} and [Mn2M(µ-C
CR)2(CO)6(dppe)2]+ have been prepared from the alkynyl complexes fac-[Mn(CCR)(CO)3(dppe)] and the appropriate reagents to generate the metal–ligand fragments ML. The salt [Mn2Cu(µ-C
CBut)2(CO)6(dppe)2] PF6·0.5CH2Cl2 has been characterized by X-ray diffraction. Several equilibria in solution involving the cationic species with free σ-alkynyl complex and P(C6H4Me-2)3 have been observed and their reactions with Cl– have been examined.