Synthesis, Crystal Structure and Catechol Oxidase Mimic Activity of a Binuclear Copper Complex

A dinuclear copper complex [Cu2LCl2](ClO4)(2) (L = 2,2'-(piperazine-1,4-diyl)bis-(N,N-bis(pyridine-2-ylmethyl)ethan-1-amine)) has been synthesized and structurally characterized. It crystallizes in triclinic, space group P (1) over bar with a = 8.5707(9), b = 10.5083(12), c = 11.4878(13) angstrom, alpha = 76.197(2), beta = 88.271(2), gamma = 87.855(2)degrees, V = 1003.81(19) angstrom(3), Z = 1, F(000) = 478, D-c = 1.544 Mg/m(3), M-r = 933.60, mu = 1.383 mm(-1), the final R = 0.0669 and wR = 0.1486 for 3675 observed reflections with I > 2 sigma(I). Its catechol oxidase mimic activity was studied spectroscopically by using 3,5-di-tert-butylcatechol (3,5-DTBC) as the substrate. The results showed that the kinetics of catechol catalyzed by the complex accorded with the Michaelis-Mentent equation, and the catechol oxidase catalytic activity of the complex increased with increasing the pH values.