A supramolecular chloride–water tape of six- and five-membered rings as template in the crystal structure of di-μ2-hydroxo-bis(diethylenetriamine) dicopper(II) dichloride trihydrate, {[Cu(dien)(μ-OH)]+Cl−}2 · 3H2O

Water molecules in association with chloride anions form supramolecular self-assembled tapes made of fused five- and six-membered rings, [(H2O)3Cl(OH)] and [(H2O)4Cl(OH)], serving as a template in the crystal structure of dinuclear {[Cu(dien)(μ-OH)]+Cl−}2 · 3H2O, based upon a Cu2(μ-OH)2 central moiety.