A novel hydroxo-bridged cyclic tetranuclear copper(II) complex using the guanazole ligand: Synthesis, crystal structure and thermal analysis

A novel hydroxo-bridged cyclic tetranuclear copper(II) complex with the guanazole ligand (3,5-diamino-1,2,4-triazole = Hdatrz), [Cu4(datrz)4(μ2-OH)2(NO3) (H2O)6] · (NO3) · 5(H2O) (1) has considerably short Cu⋯Cu distances in the range of 3.3550(4)-3.3611(4) Å. Thermal analysis of 1 reveals that the cyclic framework constructed with hydroxo and guanazole ligands is stable up to 285 °C.