Two copper(II) coordination polymers {[Cu(bib)(nip)]·1.5H₂O}_n (1) and [Cu₂(bib)(glu)₂]_n (2) (bib = 1,4-bis(2-methyl-imidazol-1-yl)butane, H₂nip = 5-nitroisophthalic acid, H₂glu = glutaric acid) were synthesized by the hydrothermal method and characterized by single-crystal X-ray diffraction, elemental analyses, IR and solid-state diffuse-reflection spectra. 1 forms a 2D network with the point symbol of (4⁴·6²) and 2D ® 2D polythreaded network. 2 constructs the 6-connected 3D network based on the [Cu₂(COO)₂] dimer with the point symbol of (4⁴·6¹⁰·8). The energy band gaps (E_g) of 1 and 2 were 2.453 and 2.162 eV, respectively. 1 and 2 present high photocatalytic activity for the degradation of methylene blue under visible light irradiation.