Structural diversity in Cu(II) and Cd(II) coordination complexes with 4-amino-1,2,4-triazole ligand

The syntheses and structures of the series of metal complexes, namely [CuCl2(L)2·H2O)]n (L = 4-amino-1,2,4-triazole), 1; {[Cu(L)4][ClO4]2.H2O}n, 2; and [Cd2Cl4(L)2.2H2O]n, 3 are reported. These were prepared by the self-assembly of Cu(II) and Cd(II) salts with L in MeOH/H2O system. All these complexes have been characterized by elemental analysis, IR spectrum, and single crystal X-ray diffraction. Complexes 1–2 show 1-D polymeric infinite chains, while complex 3 shows 2D pleated net. The anions Cl− in complexes 1 and 3 act as bridging or terminal ligands to the metal atoms while the ClO4− anions in 2 are not coordinated to the metal centers.