Cu(II)-assisted oxidation of quinoline-2-carbaldehyde hydrazone to give [1,2,3]triazolo[1,5-α]quinoline:: The first example of Cu(I) complex containing [1,2,3]triazolo-ligand

The synthesis, single crystal structure, luminescent and electrochemistry properties of a Cu(I) compound based on in situ formation ligand, namely [1,2,3]triazolo[1,5-alpha]quinoline(L1), are reported. Complex [(Cu4Br4)-Br-I(L1)(4)] (1) is the first example of Cu(I) species with [1,2,3]triazole-ligand and provides the direct evidence for Cu(II) role to the ring-closure of hydrazone. (c) 2007 Elsevier B.V. All rights reserved.