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Novel chromium and molybdenum complexes of a dimerized isonicotinic acid hydrazide

Sunlight irradiation of [M(CO)6], M = Cr and Mo with isonicotinic acid hydrazide (inh) was investigated. The photochemical process resulted in dimerization of inh with elimination of a hydrazine molecule to give N′-isonicotinoylisonicotino hydrazide (ininh). Two complexes with molecular formulas [MO2(ininh)] were isolated and characterized by elemental analysis, infrared, mass and 1H NMR spectroscopy. The UV-vis spectra of the complexes in DMSO showed visible bands due to ligand-to-metal charge transfer. Thermal properties of the complexes were investigated by TG thermogravimetry.