Half-sandwich d6 metal complexes with bis(pyridine carboxamide) benzene ligand: Synthesis and spectral analysis

The reactions of [(arene)MCl2]2 dimers with the 1,4-bis(2-pyridine carboxamido)benzene (H2L) have been reported here with the formulations as [(arene)MCl(HL)] [where, arene = p-cymene, M = Ru (1), arene = Cp*, M = Rh (2) and Ir(3)) and [{(arene)MCl}(2)L] [where, arene = p-cymene, M = Ru (4), arene = Cp*, M = Rh (5) and Ir (6)), which resulted in a series of mono- and di-nuclear neutral complexes. These complexes have been characterized by various spectral analyses. Complexes 2-6 are additionally described by the single crystal X-ray diffraction studies. Single crystal X-ray analyses of complexes showed that they are neutral in nature and vicinity around the metal is distorted octahedral. The chloride atoms and Cp* moieties are in cis orientation with respect to the ligand in the case of complex 6. Complexes 2, 3 and 5 are crystallized with the solvent dichloromethane molecule. (C) 2017 Elsevier B.V. All rights reserved.