Mixed sulfoisophthalate and 1,2,4-triazole directed d10 metal coordination polymers: Synthesis, property and structural diversity

This work presents six d(10)-metal coordination polymers based on mixed ligands of 5-sulfoisophthalate (H2SIP-) and 1,2,4-triazoles (1H-1,2,4-triazole (Htr), 3-amino-1H-1,2,4-triazole (Hatr)), 3D [Zn-7(SIP)(2)(tr)(8)(H2O)(4)]center dot 4H(2)O (1), 3D [Zn-4(SIP)(atr)(5)(H2O)(2)]center dot 3H(2)O (2), 2D [Zn-2(SIP)(atr)(H2O)(3)]center dot 2H(2)O (3), 2D [Ag(H2SIP)(Hatr)] (4 and 5), and 3D [Cd-3(SIP)(tr)(2)(OH)]center dot H2O (6) under hydrothermal conditions. The structural analysis indicates a ligand directed structural diversity in the metal-(H)SIP-triazole system. The characterizations of 1-6 indicate that the bulk samples are pure phases, the thermal decomposition temperatures are beyond 300 degrees C, and the fluorescence are blue. The maximum emissions of 1-3 and 6 at around 410 nm are related with the intraligand pi ->pi* transitions of 1,2,4-triazole moieties, and those at ca. 350 nm in 4 and 5 are assigned to intraligand transitions of (H)SIP ligands. The temperature-dependent fluorescence of 1-6 show thermal quenchings with fluorescence quenching rates ranging 22.9-74.2%, and the fluorescence cannot recover fully when it is back to ambient temperature.