A new 3D cadmium coordination polymer containing 3-amino-1H-1,2,4-triazole: Synthesis, structure, and property

Abstract

Cadmium acetate (Cd(Ac)2) reacted with 3-amino-1H-1,2,4-triazole (Hatr) under hydrothermal conditions to produce a 3D framework, [Cd5(atr)7(Ac)3(H2O)2] (1), which is constructed through the interweaving of the 2D (4′4) layers with the 1D zigzag [Cd3(atr)2(H2O)] chains. Compound 1 was isolated with high phase purity confirmed by PXRD. TGA indicates the thermal decomposition temperature of compound 1 at 343°C, showing the framework of 1 has high thermal stability. The solid state fluorescence of 1 at ambient temperature exhibits a blue emission at 419nm, assigned to intraligand π→π⁎ transition of 1,2,4-triazole ring, which is similar to that of free Hatr with emission at 427nm. The temperature-dependent fluorescence of 1 shows a thermal quenching with 43.78% quenching rate at 200°C, and the fluorescent intensity can be completely recovered as the temperature decreased to ambient temperature.