Photochemical Reactions of VIB and VIIB Group Metal Carbonyl Complexes with a Chiral Schiff Base

Abstract

The hitherto unknown complexes, [M(CO)₄(η²‐H₂L)], [M=Cr; 1, Mo; 2, W; 3]; fac‐[Re(CO)₃Br(η²‐H₂L)], 4 and [(η⁵‐C₅H₅)Mn(CO)Br(η²‐H₂L)], 5 have been synthesized by the photochemical reactions of VIB and VIIB metal carbonyls [M(CO)₆] [M=Cr, Mo, W], Re(CO)₅Br and (η⁵‐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, ¹H‐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.

Keywords:

• N,N′‐bis‐(2‐hydroxynaphthalene‐1‐carbaldehydene)‐(1R,2R)‐(‐)‐diaminocyclohexane
• metal carbonyls
• Schiff base

We thank the Research Foundation of Dokuz Eylul and Dicle University for funds. We thank TUBITAK for allocation of time at the Mass Spectra and Elemental Analyses. We thank Dr. Yurdanur Yayla for obtaining ¹H‐NMR spectra at Ege University. This work was supported by Dokuz Eylul University, Project: 04.KB.FEN.106.