Abstract:
Oxidation catalysis is used to increase the performance of hydrogen peroxide in laundry bleach applications. Bleach catalysts provide cost-effective, energy-saving and environmentally friendly bleach systems yielding perfect stain removal at lower temperatures. This comparative study is based on the synthesis of bis[bis(salicylhydrazonephenoxy)manganese(III)] phthalocyaninatozinc(II) (2), bis[bis(salicylhydrazonephenoxy)cobalt(III)] phthalocyaninatozinc(II) (3) and bis[bis(salicylhydrazonephenoxy)iron(III)] phthalocyaninatozinc(II) (4) as tri-nuclear complexes consisting of two Schiff base complexes substituting a zinc phthalocyanine. Complexion on the periphery to obtain complexes 2, 3, 4 was performed through the reaction of a Schiff base-substituted phthalocyanine using MnCl(2)4H(2)O, CoCl(2)6H(2)O or FeCl(3)6H(2)O salts in basic condition in dimethylformamide. Fourier transform infrared, H-1 NMR, C-13 NMR, UV-visible, inductively coupled plasma optical emission and mass spectra were applied to characterize the prepared compounds. The bleach performances of the three phthalocyanine compounds 2, 3, 4 were examined by the degradation of morin as hydrophilic dye. The degradation progress in the presence of catalysts 2, 3, 4/H2O2 combination in aqueous solution was investigated using an online spectrophotometric method. It was found that the catalysts 2, 3, 4 exhibited better bleaching performance at 25 degrees C than tetraactylethylethylenediamine as bleach activator used in powder detergent formulations for stain removal. Copyright (c) 2015 John Wiley & Sons, Ltd.
