Two new Keggin-based copper-organic complexes constructed from pyrazole derivatives: Syntheses, structures and catalytic properties

Abstract

By regulating the initial reactant molar ratio, two new Keggin-based copper-organic complexes formulated as [Cu2(H2O)(L)2(HL)2](HPMo12O40)·2H2O (1) and [Cu4L4(H2O)2](H3PMo12O40) (2) (HL = 1-(4-carboxylbenzyl)-3-(pyrazine-2-yl)]pyrazole) have been synthesized triumphantly under hydrothermal conditions. Single crystal X-ray diffraction analyses show that compound 1 is a 3D supramolecular structure constructed by 1D metal–organic chains [Cu2(H2O)(L)2(HL)2]n2n+ and PMo12 anions via hydrogen bonds. Compound 2 is a 2D [Cu2L2(H2O)]n coordination polymeric network containing left and right helical chains. By hydrogen bonding interactions between adjacent [Cu2L2(H2O)]n networks and PMo12 anions, the 2D network extends to a 3D supramolecular structure. The two compounds can not only photocatalytic degrade methylene blue and Rhodamine B, but also have electrocatalytic reduction of H2O2, BrO3- and NO2– and oxidation of ascorbic acid. Moreover, their electrochemical sensing properties have also been studied. These results suggest compounds 1 and 2 can be used as multifunctional materials.