The various architectures and properties of a series of coordination polymers tuned by the central metals and auxiliary N-donor ligands

Abstract

Five new coordination polymers, namely, [Zn(HL)(bib)]n·2nH2O (1), [Zn2(L)(μ3-OH)(H2O)]n·2nH2O (2), [Cd1.5(L) (H2O)2]n·0.5nH2O (3), [Cd1.5(L) (CH3CN)]n·0.5nH2O (4) and [Cd1.5(L)(bib)(H2O)2]n·nH2O (5), (H3L = biphenyl-2,4′,5-tricarboxylic acid, bib = 4,4′-bis(imidazol-1-yl)phenyl) have been synthesized under solvothermal conditions. Complexes 1–5 have been characterized by elemental analysis, IR spectroscopy, powder X-ray diffraction (PXRD) and single-crystal X-ray diffraction analysis. Complex 1 shows a 2D (4,4) network and further forms a 3D supramolecular framework by π–π interactions. Complex 2 is a 3D framework based on infinite rod-shaped chains. Complex 3 exhibits a 3D framework with a (3,4,5)-connected {42·6}2{42·84}{43·6·86}2 topology. Complex 4 features a 3D network with a (4,4,6)-connected {44·62}3{46·67·82}2 topology. 5 displays a 3D 2-fold interpenetrating (4,4,4)-connected framework with a point symbol of {4·64·10}2{4·64·8}2{62·84}. Moreover, the thermal stabilities and photoluminescence properties of 1–5 have been investigated.