Photochemical reactions of metal carbonyls [M(CO)₆ (M=Cr, Mo, W), Re(CO)₅Br, Mn(CO)₃Cp] with salicylaldehyde ethanesulfonylhydrazone (Hsalesh)

The new complexes, M(CO)₅(Hsalesh) (M∈=∈Cr (1), Mo (2), W (3)), Re(CO)₄Br(Hsalesh) (4) and Mn(CO)₃(Hsalesh) (5) have been synthesized by the photochemical reaction of metal carbonyls M(CO)₆ (M∈=∈Cr, Mo, W), Re(CO)₅Br, and Mn(CO)₃Cp with salicylaldehyde ethanesulfonyl hydrazone (Hsalesh). The complexes have been characterized by elemental analysis, EI mass spectrometry, FT-IR and ¹H NMR spectroscopy. The spectroscopic studies show that Hsalesh behaves as a monodentate ligand coordinating via imine N donor atom in M(CO)₅(Hsalesh) (M∈=∈Cr, Mo, W) and Re(CO)₄Br(Hsalesh) and as a tridentate ligand in Mn(CO) ₃(salesh).