The reaction of copper(II) sulfate, copper(II) chloride, 3,5-diacetylamino- 1,2,4-triazole, and 3-acetylamino-5-amino-1,2,4-triazole in water yields green, plate-shaped crystals of [[ {Cu-3(mu 3OH1 (/2)) L(H2O)(2)Cl}(2) {mu-Cu(H2O)(2)Cl-2}]center dot 12H(2)O](n) ( 1), where L is a new triazole-derived macrocyclic ligand. The structure of 1 consists of heptanuclear (H) OCuII (3) - Cu-II - Cu-II O-3( H) entities linked in pairs through symmetric mu(3)-O center dot center dot center dot H center dot center dot center dot O-mu(3) hydrogen bonds to form a double-stranded one-dimensional network. A significant overall antiferromagnetic behavior has been observed for 1.