Metal–metal bond cleavage of carbene complexes by halogens: The crystal and molecular structures of ax-[Mn2(CO)9{C(OEt)2-thienyl}], [Mn(CO)4(I){C(OEt)2-thienyl}] and eq-[Mn2(CO)9{C(NH2)2-thienyl}]

摘要: The metal–metal bond in [M 2 (CO) 9 {C(OEt)R}] (M = Mn ( 1 ), Re R = 2-thienyl a) , 2-bithienyl b) ) is readily cleaved with halogens to afford cis -[M(CO) 4 (X){C(OEt)R}] 3 X = I; M = Re X = Br). In the binuclear manganese complex, carbene ligand found an axial position due steric reasons, whereas electronically favoured equatorial for ligands corresponding rhenium complexes and [Mn {C(NH )thienyl}] 5a containing a sterically less demanding NH -substituent.