An unprecedented 3D manganese(II) MOF displaying (4,5)-connected xah topology

Abstract An unusual 3D manganese(II) coordination polymer based on the flexible bis(benzimidazole) ligand, namely, [Mn(L)(ndc)] n (L = 1,4-bis(5,6-dimethylbenzimidazol-1-ylmethyl)benzene, H 2 ndc = 2,6-naphthalenedicarboxylic acid), was synthesized and characterized by IR, elemental analysis, thermal gravimetric and single-crystal X-ray diffraction. The complex exhibits an unprecedented three-fold interpenetrating xah architecture with a (4,5)-connected (4 2 .6 2 .8 2 )(4 6 .6 4 ) topology, which represents the first binodal (4,5)-connected xah network observed in coordination polymers. The fluorescence and catalytic properties of the complex for the degradation of the Congo red dye in a photo-Fenton-like process were investigated.