Two low-dimensional Schiff base copper(I/II) complexes: synthesis, characterization and catalytic activity for degradation of organic dyes

摘要

Two low-dimensional oxime-containing Schiff base copper(I/II) complexes with iodine-copper cluster [Cu2I4](2-) bridges, namely, {[(Cu4I3)-I-II(pop)(4)](2)((Cu2I4)-I-I)}center dot(CH3CN)(2)center dot H2O (2) and [(Cu4I2)-I-II(pop)(4)((Cu2I4)-I-I)center dot(CH3CN)](n) (3) (Hpop = 2-(hydroxyimino)-N'-[1-(2-yridyl)ethylidene]propanehydrazone), have been synthesized from the reaction of [2 x 2] grid-like compound {[(CuI)-I-II(pop)](4)}(2)center dot 4H(2)O (1) with equivalent (Cu2I2)-I-I (iodine-copper clusters) under solvothermal conditions and characterized by elemental analysis (EA), infrared spectroscopy (IR), thermogravimetric analysis (TGA), and X-ray single-crystal/powder diffraction. The results show that 2 is a 0-D discrete structure from an assembly of one [Cu2I4](2-) unit and two [2 x 2] molecular grids (1) via mu(3)-I atoms coordinating to Cu-I/Cu-II atoms. However, compound 3 presents a 1-D wave-like chain, which is constructed by coordination of mu(2)-I atoms from [(Cu2I4)-I-I](2-) units with Cu-II atoms in [2 x 2] molecular grids (1). Moreover, catalytic experiments demonstrated that compounds 2 and 3 have promising visible-light-driven catalytic activity in degrading various organic dyes.