X-ray Crystallographic Studies of a Bimetallic cis-Mo(CO)4(PPh2NH2CH2CH2N=CHC6H4-o-O)2Cu Complex, the Starting Material, cis-Mo(CO)4(PPh2Cl)2, and the Reaction Intermediates cis-Mo(CO)4(PPh2NH2CH2CH2NH2)2 and cis-Mo(CO)4(PPh2NH2CH2CH2N=CHC6H4-o-OH)2

In this paper, we report the crystal structures of a bimetallic trans -[ cis -Mo(CO) 4 [PPh 2 NHCH 2 CH 2 N=CH( o -C 6 H 4 O)] 2 ]Cu complex (monoclinic space group P 2/ c ), the cis -Mo(CO) 4 (PPh 2 Cl) 2 starting material, (monoclinic space group C 2/ c ) and the two reaction intermediates cis -Mo(CO) 4 (PPh 2 NHCH 2 CH 2 NH 2 ) 2 (monoclinic space group C 2/ c ) and cis -Mo(CO) 4 (PPh 2 NHCH 2 CH 2 N=CH( o -C 6 H 4 OH) 2 (orthorhombic space group P 2(1)2(1)2). The dihedral angle between the o -salicylaldiminato groups in the bimetallic complex (36.32(18)°) is considerable large than that in the previously reported trans -[ cis -Mo(CO) 4- [PPh 2 NHCH 2 CH 2 N=CH( o -C 6 H 4 O)] 2 ]Ni complex (12.6°) demonstrating that the coordination preferences of the metal dications have significant effects on the conformations of the bimetallic complexes. The orientations of the phosphinamide ligands bimetallic complex are quite different than are those in the intermediates due to the steric restraints imposed by chelation to the Cu 2+ . Graphical Abstract In this paper, we report the crystal structure of a bimetallic cis -Mo(CO) 4 (PPh 2 NH 2 CH 2 CH 2 N=CHC 6 H 4 - o -O) 2 Cu complex as well as the crystal structures of the cis -Mo(CO) 4 (PPh 2 Cl) 2 starting material and the two intermediates.