Synthesis, Crystal Structure and Photoluminescence of a Copper(Ⅰ)-iodide Coordination Polymer Based on Polyimidazolate Ligand

A copper（Ⅰ）-iodide coordination polymer, namely {[Cu3 I3（Tipa）2]·3（DMF）}n（1）, was synthesized from tetrahedral Cu4 I4（py）4 precursor and tris(4-（;H-imidazol-1-yl）phenyl) amine)（Tipa） ligand in N,N-dimethylformamide（DMF） and methanol, and characterized by single-crystal X-ray diffraction. Its crystal crystallizes in monoclinic system, space group P2/c with a = 12.849（4）, b = 12.034（3）, c = 24.619（7） ?, β = 104.681（4）°, Mr = 1604.52, V = 3682.4（18） ?3, Z = 2, Dc = 1.447 g/cm3, μ = 2.163 mm-1, S = 0.975, F（000） = 1580, the final R = 0.0835 and wR = 0.2354 for 6471 observed reflections(I > 2σ（I）). In compound 1, the Cu4 I4（py）4 was in-situ changed into another neutral CuI unit. Interestingly, two CuI units and two imidazole rings of the tipa ligands form a macrocyclic loop, which are further linked by another CuI unit and the third imidazole ring of the tipa ligands to produce a 1 D loop-containing chain. Solvent molecules were filled in the pore of the loop, which prevents the interpenetration of each other. The packing of these 1 D chains generates a 1 D channel along the a-axis, which is filled by disordered DMF molecules. In addition, compound 1 exhibits high thermal stability and strong photoluminescence at room temperature.