Syntheses, Crystal Structures, and Photocatalytic Activities of Three Copper Coordination Polymers Based on Bis(1H-imidazol-4-yl)benzene/3-(2-Pyridyl)pyrazole
Three copper(II) coordination polymers (CuCPs), namely, [Cu-0.5(1,4-bib)(SO4)(0.5)](n) (1), {[Cu(1,3-bib)(2)(H2O)]center dot SO4 center dot H2O}(n) (2), and [Cu(bpz)(SO4)(0.5)](n) (3), were assembled from the reaction of three N-donors [1,4-bib = 1,4-bis(1H-imidazol-4-yl)benzene, 1,3-bib = 1,3-bis(1H-imidazol-4-yl)benzene, and Hbpz = 3-(2-pyridyl) pyrazole] with copper sulfate under hydrothermal conditions. Their structures were determined by single-crystal X-ray diffraction analyses and further characterized by elemental analyses (EA), IR spectroscopy, powder X-ray diffraction (PXRD), and thermogravimetric analyses (TGA). Structure analyses reveal that complex 1 is a 3D 6-connected {4(12).6(3)}-pcu net, complex 2 is a fourfold 3D 4-connected 6(6)-dia net, whereas complex 3 is a 1D snake-like chain, which further expanded into 3D supramolecular architectures with the help of C-H center dot center dot center dot O hydrogen bonds. Moreover, the photocatalytic tests demonstrate that the obtained CuCPs are photocatalysts in the degradation of MB with the efficiency is 86.4% for 1, 75.3% for 2, and 91.3% for 3 after 2 h, respectively.