Photochemical reactions of VIB and VIIB group metal carbonyl complexes with a chiral Schiff base

The hitherto unknown complexes, [M(CO)(4)(eta(2)-H2L)], [M = Cr; 1, Mo; 2, W; 3]; fac-[Re(CO)(3)Br(eta(2)-H2L)], 4 and [(eta(5)-C5H5)Mn(CO)Br(eta(2)-H2L)], 5 have been synthesized by the photochemical reactions of VIB and VIIB metal carbonyls [M(CO)(6)] [M = Cr, Mo, W], Re(CO)(5)Br and (eta(5)-C5H5) Mn(CO)(3) with chiral Schiff base N,N'-bis-(2-hydroxynaphthalene-1-carbaldehydene)-(1R,2R)-(-)-diaminocyclohexane (H2L) in THF and characterized by elemental analyses, FTIR, H-1-NMR and mass spectra. The spectroscopic studies show that H2L ligand is coordinated to the central metal as a bidentate ligand coordinating via its imine nitrogens (C=N) in 1-5.