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Catalytic properties of dimeric molybdenum(VI) triketonates were compared to those of MoO 2 (acac) 2 in the epoxidation reaction of cyclooctene and 1,5-cyclooctadiene with tertiary butyl hydroperoxide. Studies of the reaction at a molar ratio of olefin:TBHP:catalyst= 1:1:0.001 for the monoolefin and 1:2:0.001 for the diolefin at 40 and 80 °C in dichloroethane were carried out. The dimeric Mo(VI) complexes preferentially catalyzed the production of a monoepoxide.

Complexes containing the soft acid metals Pt, Pd, Ag, and Au, with the ligand 1,3-dimethylimidazolium-2-dithiocarboxylate (L) have been synthesized and characterized by analytical data and infrared and electronic spectroscopy. The data suggest that the ligand acts as a bidentate ligand with Pt and Pd, a monodentate ligand with Ag and a bridging ligand between two Au atoms.

Two nickel(II) complexes, NiL 2 Cl 2 and NiL 2 – (NO 3 ) 2 ·0.3EtOH, with the ligand 1,3-dimethyl- imidazoliumdithiocarboxyalato (L) have been synthesized and characterized by infrared and electronic spectroscopy and magnetic susceptibilities. The complexes exhibit the normal paramagnetism characteristic of octahedral nickel(II). The magnetic moments decrease with falling temperature, indicative of antiferromagnetic coupling, which is greater for the chloride than for the nitrate adduct. Columnar structures with chloro and nitrato bridging are proposed.