Metallovesicular catalytic hydrolysis of p-nitrophenyl picolinate catalyzed by zinc(II) complexes of pyridyl ligands in vesicular solution

The hydrolysis of p-nitrophenyl picolinate (PNPP) catalyzed by the Zn(II) complexes of 6-(n-butyloxymethyl)-2-(hydroxymethyl)pyridine and 6-(n-dodecyloxymethyl)-2-(hydroxymethyl)pyridine was kinetically investigated by observation of the rates of release of p-nitrophenol in a vesicular solution at different pH values and temperatures. A 1:1 ligand:Zn2+ stoichiometry was found to produce the most active species based on a kinetic version of the Job plot analysis. Experimental results also showed that the complex formed from ligand 2 and Zn2+ exhibited a more remarkable rate acceleration effect on the hydrolysis of PNPP in vesicular solution than that formed from ligand 1 and Zn2+.