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Technetium(I) carbonyl complexes such as [Tc(CO)3(salbut)]2 (salbut= 2-(1-butylnitrilomethylidyne)phenolato), Tc(CO)3(salbut)(CH3CN) and Tc(CO)3(salbut)(py) (py= pridine) with Schiff base ligands were synthesized. The Binuclear complex [Tc(CO)3(salbut)]2 is the first phenoxo-bridged dinuclear technetium complex. From X-ray crystallography, this dinuclear complx was revealed to be a "dimer" composed of two Tc(CO)3(salbut) subunits bridged by two oxygen atoms of the salbut ligand. The two Tc(CO)3(salbut) subunits are in inversion symmetry each other. Schiff base Hsalbut loses a phenol proton through the ligand exchange reaction and coordinates to the technetium atom as a bidentate ligand with nitrogen and oxygen atoms. Three carbonyl ligands coordinate to the technetium atom in a facial configuration. Structures of [Tc(CO)3(salbut)]2 in solvents were investigated by NMR and UV-vis spectroscopy. The mononuclear complex Tc(CO)3(salbut)(soly) (solv=solvent molecule) was formed in strong Lewis base solvents like acetonitrile and pyridine. In weak Lewis base solvents like dichloromethane and benzene, on the other hand, the dinuclear [Tc(CO)3(salbut)]2 complex was stable.

Phenoxo-Bridged Dimeric Structure of Technetium (I) Tricarbonyl Complex with Schiff Base Ligand