A new 1D coordination chain containing 4,4′-bi-1,2,4-triazole bridge: Synthesis, structure and optical properties

A new 1D coordination polymer [Cu(trtr)Cl2]n · 2nH2O (trtr = 4,4′-bi-1,2,4-triazole) was synthesized from the solution reaction of CuCl2 and trtr. The polymer is constructed by an inorganic skeleton chain [CuCl2]n with trtr anchoring on both sides like wing. The lattice water plays a significant role in the construction of the 3D super-molecular architecture by forming hydrogen bondings between trtr and water molecules. The fluorescence spectrum of the title compound features a dual-peak at 420 and 439 nm originating, respectively, from the π–π∗ intraligand transition and LMCT. Diffuse reflectance spectrum of the compound reveals the presence of optical gap of 2.45 eV, suggesting that the compound possesses semiconducting character.

Graphical abstractA new 1D coordination polymer [Cu(trtr)Cl2]n · 2nH2O (trtr = 4,4′-bi-1,2,4-triazole) was synthesized from the solution reaction of CuCl2 and trtr. The polymer is constructed by a inorganic skeleton chain [CuCl2]n with trtr anchoring on both sides like wing. The title compound features a dual-peak emission at 420 and 439 nm originating, respectively, from the π–π∗ intraligand transition and LMCT. The optical gap of 2.45 eV suggests the compound possesses semiconducting character.Figure optionsDownload full-size imageDownload as PowerPoint slide