Peroxidative Oxidation of Alkanes and Alcohols under Mild Conditions by Di- and Tetranuclear Copper (II) Complexes of Bis (2-Hydroxybenzylidene) Isophthalohydrazide.

ABSTRACT: Bis(2-hydroxybenzylidene)isophthalohydrazide (H?L) has been used to synthesize the dinuclear [Cu?(1?NO²:2?N'O'²-H?L)(NO?)?(H?O)?] (1) and the tetranuclear [Cu?(?-1?NO²:2?N'O²-H?L)?(?-NO?)?(H?O)?]·2C?H?OH (2) complexes. The solvent plays an important role in determining the ligand behaviour in the syntheses of the complexes. An ethanol-acetonitrile mixture of solvents favours partials enolization in the case of 2. Both complexes have been characterized by elemental analysis, infrared radiation (IR), single crystal X-ray crystallography and electrochemical methods. The variable temperature magnetic susceptibility measurements of 2 show strong antiferromagnetic coupling between the central nitrato-bridged Cu (II) ions. The catalytic activity of both 1 and 2 has been screened toward the solvent-free microwave-assisted oxidation of alcohols and the peroxidative oxidation of alkanes under mild conditions. Complex 1 exhibits the highest activity for both oxidation reactions, leading selectively to a maximum product yield of 99% (for the 1-phenylethanol oxidation after 1 h without any additive) and 13% (for the cyclohexane oxidation to cyclohexyl hydroperoxide, cyclohexanol and cyclohexanone after 3 h).

SUBMITTER: Sutradhar M 

PROVIDER: S-EPMC6222479 | biostudies-literature | 2018 Oct

REPOSITORIES: biostudies-literature