Synthesis, spectral, catalytic, and thermal studies of vanadium complexes with quadridentate schiff bases

The paper reports the synthesis and characterization of vanadium complexes of N,N′-(±)- trans - bis (2,4-dihydroxyacetophenone)-1,2-cyclohexanediamine (H 2 L 1 ) and N,N′-(±)- trans -bis(2,4-dihyroxy-5-nitroacetophenone)-1,2-chyclohexanediamine (H 2 L 2 ). All the complexes were characterized by elemental analysis, magnetic susceptibility measurements, infrared and electronic spectra, and thermogravimetric analysis. The X-ray patterns of the [VO(L 1 )] · H 2 O ( I ) and [VO(L 2 )] · H 2 O ( II ) complexes show the monoclinic system with the unit cell parameters a = 26.1352, b = 11.7149, c = 6.0401 β = 115.38° and a = 29.3787, b = 12.9398, c = 5.9175 β = 96.84°, respectively. The complexes I and II catalyze the oxidation of styrene in the presence of hydrogen peroxide.