Assembly, Structure, and Properties of Six Coordination Polymers Based on 1,3,5-Tri-4-pyridyl-1,2-ethenylbenzene

Six coordination polymers including [Cd(tpeb)X2]n (1: X = Br, 2: X = I), [Cu(tpeb)I]n (3), [Cd2I2(tpeb)2(1,4-bdc)]n (4), {[Co(tpeb)(dpa)]·MeCN}n (5), and {[Ni2(tpeb)3(oba)2]·solvent}n (6) were prepared from solvothermal reactions of 1,3,5-tri-4-pyridyl-1,2-ethenylbenzene (tpeb) with CdII, CuI, CoII, or NiII salts in the absence or presence of 1,4-benzenedicarboxylic acid (1,4-H2bdc), 2,2′-biphenyldicarboxylic acid (H2dpa), and 4,4′-oxybisbenzoic acid (H2oba). Compounds 1–3 have 1D chain structures while 4 holds a 2D wave-like network. Compound 5 adopts a 3D (3,5)-connected net with a Schlafli symbol of 33.48.513.63.7 and 6 possesses a 3D 5-connected net with a Schlafli symbol of 42.65.7.82. Compound 2 as a representative photocatalyst shows efficient degradation of rhodamine B in water while 5 displays highly selective sensing of p-nitrophenol in water through fluorescence quenching.