Anion-regulated assemblies of diverse CuII coordination complexes with a versatile tripyridyltriazole ligand

In this work, a series of five CuII coordination complexes, {[Cu(L)(dca)(OAc)]⋅1.5H2O}n (1), [Cu(L)(dca)Br]2 (2), [Cu(L)(OAc)2]2 (3), [Cu(L)Cl2]2 (4), and [Cu(L)2(ClO4)2] (5), have been prepared with a novel tripyridyltriazole ligand 3,4-bis(2-pyridyl)-5-(3-pyridyl)-1,2,4-triazole (L) and different CuII sources. Single-crystal X-ray diffraction analysis reveals that these complexes show diverse 1-D (for 1), dimeric (for 2–4) and monomeric (for 5) coordination motifs, in which the L ligands exhibit different coordination fashions. These results obviously demonstrate that the structural assembly of complexes 1–5 can be exclusively dominated by the counter anions of metal salts and the auxiliary dicyanamide (dca) anion. Their thermal stabilities have also been investigated and discussed.