Syntheses, Crystal Structures and Photoluminescent Properties of Three Zinc(II) Coordination Polymers Constructed from 9,10-Di(1H-imidazol-1-yl)anthracene

Three zincan coordination polymers, [Zn-2(DIA)(bdc)(2)](n) (1), ([Zn(DIA)(ede)]center dot H2O)(n) (2) and [Zn(DIA)(chdc)](n) (3) (DIA=9,10-di(1H-imidazol- 1-yl)anthracene, H(2)bdc=1,4-benzenedicarboxylic acid, H(2)cdc=4,4' -carbonyldibenzoic acid, H(2)chdc=trans-1,4-cyclohexanedicarboxylic acid), have been synthesized and characterized by IR spectroscopy, elemental analyses, thermogravimetric analyses and single-crystal X-ray diffraction. Structural analyses reveal that complex 1 displays an unprecedented three-dimensional (3D) (4,7)-connected framework featuring {3(2).4.5(2).6} (3(2).4(8).5(4).6(5).7(2)} topology. Complex 2 has a two-dimensional (2D) structure, which is further packed into a 3D supramolecular architecture by intermolecular weak interactions, whereas complex 3 features a 2D two-fold interpenetrating layer structure. The results show that the length and the flexibility of the carboxylates exert obvious influence on the resulting architectures. Meanwhile, the photoluminescent properties of three complexes at room temperature were also investigated.