New 2D and 3D Cd(II) coordination polymers from aromatic dicarboxylate and 1,3-bis(5,6-dimethylbenzimidazol-1-yl)-2-propanol ligands: Syntheses, structures, photocatalytic, and luminescence sensing properties

Two new Cd(II) coordination polymers, namely {[Cd(L(tp)center dot 2H(2)O}(n)(1) and {[Cd(L)(5-hip)]center dot 2.66H(2)O}(n) (2), where L = 1,3-bis(5,6-dimethylbenzimidazol-1-yl)-2-propanol, H(2)tp = terephthalic acid and 5-H(2)hip = 5-hydioxyisophthalic acid, were hydrothermally synthesized and characterized by single crystal X-ray diffraction, elemental analysis, IR spectroscopy, powder X-ray diffraction (PXRD) and thermogravimetric analyses. 1 possesses a 4,4-connected two-dimensional 4,4L10 network with a point symbol of {3(2).4.6(2).7}(2){3(2).6(2).7(2)}. 2 displays a 3,5-connected three-dimensional 3,5T1 framework with a point symbol of {4(2).6(5).8(3)}{4(2).6}. 1 and 2 attained highly photocatalytic efficiency toward the decomposition of methylene blue (MB) under UV light irradiation. Furthermore, 2 was successfully applied in selective sensing of Fe3+ and Cr2O72- ions with the low detection limit 1.56 x 10(-7) M and 2.79 x 10(-7) M, respectively.