Spectrophotometric titration was used to study complexation reactions of Zn 2,3,7,8,12,13,17,18-octaethylporphyrinate and Zn 5,10,15,20-tetraphenylporphyrinate with pyridine in binary solvents toluenemethanol and toluene-ethanol at different alcohol concentrations at 20°C. Capability of both porphyrinates to give complexes with pyridine in a binary solvent, i.e., toluene-monobasic alcohol, was found to decrease by more than one order of magnitude as the alcohol concentration increased from 0 to 1 mole fraction. The effect of the solvent polarity and extent of its association due to hydrogen bonds on the complexing capability of both porphyrinates was discussed.
Russian Journal of Coordination Chemistry – Springer Journals
Published: Oct 7, 2006
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