Two multidentate ligands utilizing triazolyl, pyridinyl and phenolate groups as donors for constructing dinuclear copper(II) and iron(III) complexes: Syntheses, structures, and electrochemistry

摘要

Two multidentate ligands 2,2'-(1,1'-(pyridine-2,6-diylbis(methylene)) bis(1H-1,2,3-triazole-4,1-diyl))bis(methylene)bis((pyridin-2-ylmethyl)azanediyl)bis(methylene)diphenol (H2LI) and N,N'-((1,1'-(pyridine-2,6-diylbis(methylene))bis(1H-1,2,3-triazole-4,1-diyl))bis(methylene))bis(1-(pyridin-2-yl)-N-(pyridin-2-ylmethyl)methanamine) (L-II) containing triazolyl, phenolate and pyridinyl groups were prepared by click reaction between diazide and terminal alkynes in the presence of catalyst CuI. Both ligands were reacted with Cu2+ and Fe3+ salts to give three dinuclear complexes [(LCu2)-Cu-I](BPh4)(2)center dot 2DMF (1), [L-II(DMF)(2)Cu-2](ClO4)(4)center dot H2O (2) and [L-II(FeCl2) (2)](PF6)(2) (3). All complexes were characterized by IR, UV-Vis spectra and element analysis. X-ray analysis revealed that the Cu2+ centers in complexes 1 and 2 adopted the distorted trigonal bipyramidal geometry, and the Fe3+ center in complex 3 chose an octahedral geometry. In addition, the electrochemistry of complexes 1-3 was investigated. (C) 2014 Elsevier B.V. All rights reserved.