Two 3D cadmium(II) coordination polymers modulated by flexible bis(benzimidazole) ligands displaying high photocatalytic activities for degradation of methylene blue and methyl orange

Abstract

Two coordination polymers (CPs), namely, {[Cd(L1)(1,4-ndc)]n (CP 1) and {[Cd(L2)1.5(BDC-Cl4)]·H2O}n (CP 2) (L1 = 1,4-bis(benzimidazol-1-yl)butane, L2 = 1,6-bis(benzimidazol-1-yl)hexane, 1,4-H2ndc = 1,4-naphthalenedicarboxylic acid, and H2BDC-Cl4 = 2,3,5,6-tetrachloroterephthalic acid) were synthesized and characterized by IR spectra, powder X-ray diffraction (PXRD), elemental analysis and single crystal X-ray diffraction analysis. CP 1 is a 4-connected Cd(II) CP with a 3D 2-fold interpenetrated cds framework. CP 2 is a 3D 5-connected architecture with sqc12 topology. The CPs 1 and 2 present excellent photocatalytic activities for degrading of methylene blue (MB) and methyl orange (MO) under UV light irradiation. Moreover, the photoluminescence properties and thermal stabilities of CP 1 and CP 2 are also discussed.