Journal
MOLECULES
Volume 23, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/molecules23102699
Keywords
Cu (II) complexes; microwave assisted oxidation of alcohols; oxidation of alkanes; solvent free process; magnetism
Funding
- Fundacao para a Ciencia e a Tecnologia, Portugal [UID/QUI/00100/2013, PTDC/QEQ-ERQ/1648/2014, PTDC/QEQ-QIN/3967/2014]
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Bis(2-hydroxybenzylidene)isophthalohydrazide (H4L) has been used to synthesize the dinuclear [Cu-2(1 kappa NO2:2 kappa N'O'(2)-H2L)(NO3)(2)(H2O)(2)] (1) and the tetranuclear [Cu-4(mu-1 kappa NO2:2 kappa N'O-2-H2L)(2)(mu-NO3)(2)(H2O)(4)]center dot 2C(2)H(5)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).
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