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Photochemical Reactions of [M(CO)6] (M = Cr, MO & W) with Quadridentate Schiff Bases

Ayodhya Singh, Munesh Kumar, Manish Kaushik and Atul Kumar

The new complexes [(μ-CO)2Cr2(η4 -H2L)2], 1; [(μ-CO)M2(CO)2(η4 -H2L)2], [M = Mo; 2, W; 3]; [(μ-CO)2Cr2(η4 -H2L')2], 4 and [(μ-CO) M2(CO)2(η4 -H2L')2], [M = Mo;5, W;6] have been synthesized by the photochemical reactions of photogenerated intermediate, M(CO)5THF (M = Cr, Mo, W) with three oxygen and one nitrogen donor Schiff base ligands, 2-hydroxybenzamido-2-hydroxybenzaladimine (H2L) and 2-hydroxybenzamido-2-hydroxy-3-methoxybenzaladimine (H2L'). The complexes have been characterized by elemental analyses, magnetic studies, infrared spectroscopy. The spectroscopic studies show that H2L and H2L' ligands are coordinated to the central metal as tetra-dentate ligands coordinating via their imine N and O donor atoms.