Self‐assembly of Two Cobalt(II) Coordination Polymers Derived from Tetrabromoterephthalate and Flexible Bis(Benzimidazole) Co‐ligands

Abstract

AbstractTwo new cobalt(II) coordination polymers, {[Co(L1)(tbta)]·0.8H2O}n (1) and {[Co(L2)(tbta)]·H2O}n (2) [L1 = 1,1′‐(1,3‐propanediyl)bis(2‐methylbenzimidazole), L2 = 1,2‐bis(2‐methylbenzimidazole‐1‐ylmethyl)benzene, H2tbta = tetrabromoterephthalic acid] were obtained under hydrothermal conditions and structurally characterized by single‐crystal X‐ray diffraction methods, IR spectroscopy, TGA, and elemental analysis. The cobalt atoms present similar environments with tetrahedral arrangements in 1 and 2. The two complexes show a 2D (4,4) coordination network with sql topology. Compound 2 is further extended into a rare 3,3,4T3 three‐dimensional supramolecular framework by weak C–H···O hydrogen bonding interactions. The fluorescence and catalytic properties of the complexes for the degradation of the congo red azo dye in a Fenton‐like process were investigated.