Photoluminescent Metal−Organic Polymer Constructed from Trimetallic Clusters and Mixed Carboxylates

The solvothermal reaction of zinc acetate dihydrate with a mixture of benzene-1,4-dicarboxylic acid (H2BDC) and benzene-1,3,5-tricarboxylic acid (H3BTC) in a solution containing N,N‘-dimethylformamide (DMF), absolute ethanol, and chlorobenzene gave rise to a metal−organic polymer, Zn3·BDC·2BTC·2NH(CH3)2·2NH2(CH3)2. The structure of this polymer possesses a unique three-dimensional framework with tri-zinc clusters, and BDC and BTC units colinking the clusters. Moreover, this metal−organic polymer exhibits strong photoluminescence at room temperature, and the main emission band is at about 430 nm (λex = 325 nm). Crystal data for this compound (C17H20N2O8Zn1.5): monoclinic, space group P21/n, cell dimensions a = 11.6171(3) Å, b = 14.2456(4) Å, c = 12.6426(3) Å, β = 107.030(2)°, V = 2000.51(9) Å3, and Z = 4.