C 6 H 10 CdN 8 O 6 ,monoclinic, P12 1 /c1(no. 14), a =9.456(4) Å, b =9.492(4) Å, c =6. Source of materialThe title compound was synthesized by the solvent evaporation method. 3-Amino-1,2,4-triazole-5-carboxylic acid (HL, 0.0128 g, 0.1 mmol) was dissolved in aN aOH solution (1.0 mol/L, 1.0 ml). The mixture was diluted by 10 ml distilled water and 10 ml EtOH, and the pH value was adjusted to 4.0 with HCl solution (1.0 mol/L). Cd(Ac) 2 · 2H2O(0.0532 g, 0.2 mmol) was dissolved in distilled water (5.0 ml) and then added to the above mixed solution.The reaction mixture was filtered and the filtrate was left undisturbedly at room temperature. The colorless crystals were obtained after two weeks. Experimental detailsAll Hatoms were positioned geometrically and allowed to ride on their parent atoms at distances of d(Csp 2 -H) =0 .93 Å with U iso(H) =1.2 Ueq(parent atom), d(N-H) =0.86 Å with Uiso(H) = 1.2 U eq (parent atom) and d(O-H) =0 .85 Å with U iso (H) = 1.5 U eq (parent atom).