Highly efficient electrochemiluminescence based on 4-amino-1,2,4-triazole Schiff base two-dimensional Zn/Cd coordination polymers

Abstract

Four coordination polymers, formulated as [Zn(L¹)₂]_n (1), [Cd(L¹)₂]_n (2), [Zn(L²)₂]_n (3) and [Cd(L²)₂]_n (4) (HL1 is (E)-2-(((4H-1,2,4-triazol-4-yl)imino)methyl)-4,6-dibromophenol; HL2 is (E)-2-(((4H-1,2,4-triazol-4-yl)imino)methyl)-4,6-dichlorophenol) have been synthesized through vial reactions. The four compounds were structurally characterized by single crystal X-ray diffraction, elemental analysis, PXRD, and fluorescence spectroscopy. For 1-4, a detailed analysis of Hirshfeld surfaces and fingerprint plots facilitates a comparison of intermolecular interactions, which are crucial in building different supramolecular architectures. C-HX (X = Br, Cl) interactions play a crucial role in stabilizing the self-assembly process among adjacent 2-D networks for both complexes. Above all, complexes 1-4 showed highly intense electrochemical luminescence (ECL) in DMF solution and high thermal stability.