Wen-Juan Ji

Hydrothermal synthesis, crystal structures, and blue photoluminescence of two 2-D Ag–1,2,4-triazolate coordination polymers with 4462 topology

Two 2-D metal-organic coordination polymers, {[Ag(NH2–BPT)] · NO3} n (1) and {[Ag(BPT)] · H2O} n (2), have been synthesized via self-assembly of AgNO3 and 4-amino-3,5-bis(3-pyridyl)-1,2,4-triazole (NH2–BPT) under hydrothermal conditions by controlling the reaction temperatures. Lower reaction temperature (140°C) led to formation of 1, which crystallizes in the monoclinic system, space group C2/c, a = 24.001(3), b = 15.844(2), and c = 12.981(3) Å, V = 2996.8(6) Å3, Z = 8. When the temperature was increased to 180°C, in situ deaminization of the organic ligand led to crystallization of 2 (space group P21 /n, a = 7.3106(10), b = 19.633(2), and c = 9.0596(16) Å, V = 1190.2(3) Å3, Z = 4). The NH2–BPT in 1 and BPT in 2 are μ4 tetradentate utilizing two triazolyl and two pyridyl nitrogens, generating an unusual 2-D layer, in which binuclear Ag(I) motifs and organic ligands are four-connecting nodes that inter-link in 4462 topology. Adjacent 2-D metal-organic layers are linked by a system of hydrogen bonds to form 3-D supramolecular frameworks. Strong blue fluorescence emissions are observed for 1 and 2 in the solid state at ambient temperature.

Ionic liquids used for synthesis of supramolecular isomeric open-frameworks as photocatalysts for visible-light-driven degradation of organic dyes

Two supramolecular isomeric anionic porous coordination frameworks synthesised using ion liquids contain similar linear trinuclear zinc motifs but exhibit quite different (4,7)- and (4,6)-connected topologies. Isomer 1 can degrade methylene blue (MB) effectively under UV-light-irradiation, but isomer 2 showed remarkable visible-light-driven degradation of diverse organic dyes.