Abstract

Two μ-alkoxide/acetate-bridged small molecule binuclear copper(II) complexes were synthesized, and used to promote the hydrolysis of a classic carboxylic acid ester, p-nitrophenyl picolinate (PNPP). Both binuclear complexes exhibited good hydrolytic reactivity, giving rise to ca. 15547- and 17462-fold acceleration over background value for PNPP hydrolysis at neutral conditions, respectively. For comparing, activities of the other two mononuclear analogues were evaluated, revealing that binuclear complexes show approximately 150- and 171-fold kinetic advantage over their mononuclear analogues. This study reports the hydrolysis of p-nitrophenyl picolinate (PNPP) with increase of rate acceleration up to four orders of magnitude by two μ-alkoxide/acetato-bridged binuclear copper(II) complexes when compared to uncatalysed reaction. Furthermore, the two binuclear complexes were more active than their mononuclear analogues in the catalytic hydrolysis of PNPP.

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