Design, synthesis and properties of a trinuclear copper(I) cluster with a triazenide ligand

Abstract The reaction of methyl anthranilate, sodium nitrite, and 2-aminobenzothiazole produces a new triazenide, namely, 1-[(2-carboxymethyl) benzene]-3-[benzothiazole]triazene (HL). In the presence of Et 3 N, the reaction of HL and CuCl in THF/methanol gives a trinuclear copper(I) cluster [Cu 3 L 3 ] THF CH 3 OH ( 1 THF CH 3 OH), which has been characterized by X-ray crystallography, cyclic voltammogram and emission spectrum. CV of 1 reveals two reversible waves at –0.06 and 0.83 V, which correspond to two one-electron oxidation of Cu 3 units ([Cu 3 ] 4+ /[Cu 3 ] 3+ ) and ([Cu 3 ] 5+ /[Cu 3 ] 4+ ), respectively. 1 appears photoluminescent ( λ max  = 502 nm) at room temperature.