Syntheses, Structures, and Catalytic Properties of Two 2D Manganese(II) Coordination Polymers Containing Flexible Bis(benzimidazole) Ligands

Two Mn-II coordination polymers based on the flexible bis(benzimidazole) and dicarboxylic acids, namely, [Mn(L1)(bpdc)(H2O)(0.5)](n) (1) and [Mn(L2)(Htbi)(2)](n) (2) [L1 = 1,4-bis(5,6-dimethylbenzimidazol-1-ylmethyl)benzene, H(2)bpdc = 4,4'-biphenyldicarboxylic acid, L2 = 1,4-bis(5,6-dimethylbenzimidazole)butane, H(2)tbi = 5-tert-butyl isophthalic acid] were hydrothermally synthesized and characterized by elemental analysis, IR spectroscopy, as well as single-crystal X-ray diffraction. Both of the complexes crystallize in the triclinic P (1) over bar space group and present distorted octahedral configurations. Complex 1 possesses a 2D binodal (3,5)-connected 3,5L2 network with the point symbol of (42.67.8)(42.6), whereas 2 features a 2D uninodal 3-connected hcb topology and the Schlafli symbol is (63). Complexes 1 and 2 ultimately are extended into 3D supramolecular framework via pi-pi stacking and O-H center dot center dot center dot O hydrogen bonding interaction, respectively. Moreover, both of the complexes manifest excellent catalytic activities for the degradation of Congo red.