Binuclear Cu(I) complex of (N′1E,N′2E)-N′1,N′2-bis(phenyl(pyridin-2-yl)methylene)oxalohydrazide: Synthesis, crystal structure and catalytic activity for the synthesis of 1,2,3-triazoles

A new binuclear 5-coordinate distorted trigonal bipyramidal Cu(I) complex with (NI E,N'2E)-N'1,N'2-bis(phenyl(pyridin-2-yl) methylene) oxalohydrazide (H(2)bpoh) has been synthesized, and characterized by spectroscopic and single crystal X-ray diffraction techniques. In the complex, H2bpoh acts as a dibasic hexadentate ligand bonding with two Cu(l) each through a carbonylate-0, azomethine-N, and pyridyl-N atoms. The complex possess a CuN2OP2 core with a considerable delocalization of charge on the fivemembered chelate rings which forms an unusual intra-molecular pi-pi stacking and C-H center dot center dot center dot pi interactions. The synthesized complex exhibits excellent catalytic efficiency for a click reaction at room temperature. (C) 2014 Elsevier B.V. All rights reserved.