Two intriguing hydroxy-copper(II) coordination polymers with bis(triazole) and bicarboxylate ligands: Syntheses, structures and photocatalytic degradation of organic dyes

Two intriguing coordination polymers [Cu-2(OH)(mbtx)(sip)(H2O)(2)](n) (1) and {[Cu-3(OH)(2)(mbtx)(nip)(2)]center dot H2O}(n) (2) were synthesized by the hydrothermal method and characterized by elementary analysis, IR, PXRD, diffuse reflectance spectra and single-crystal X-ray diffraction (mbtx = 1,3-bis(1,2,4-triazol-4-yl) benzene, sip = sulfoisophthalate, nip = 5-nitroisophthalate). 1 shows an unusual 3-connected 2D network based on the dimeric hydroxy-copper(II) cluster [Cu-2(mu-OH)] with the point symbol of 6(3).2 exhibits an unusual 3D network based on 1D hydroxyl-copper(II) chains [Cu-3(OH)(2)](n). 1 and 2 are highly efficient and universal photocatalysts for the degradation of the organic dyes such as methyl orange (MO), methylene blue (MB) and rhodamine B (RhB) under UV irradiation. The photocatalytic mechanism was supposed. (C) 2017 Elsevier B.V. All rights reserved.