Template-Directed One- and Two-Dimensional Copper(II) Diphosphonates: Structures and Characterizations of (NH<sub>4</sub>)<sub>2</sub>Cu<sub>3</sub>(hedp)<sub>2</sub>(H<sub>2</sub>O)<sub>4</sub>, [NH<sub>3</sub>(CH<sub>2</sub>)<sub>4</sub>NH<sub>3</sub>]Cu<sub>3</sub>(hedp)<sub>2</sub>·2H<sub>2</sub>O, and [NH<sub>2</sub>(C<sub>2</sub>H<sub>4</sub>)<sub>2</sub>NH<sub>2</sub>]Cu<sub>3</sub>(hedp)<sub>2</sub> (hedp = 1-Hydroxyethylidenediphosphonate)
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Three new copper(II) diphosphonates, (NH4)2Cu3(hedp)2(H2O)4 (1), [NH3(CH2)4NH3]Cu3(hedp)2·2H2O (2), and [NH2(C2H4)2NH2]Cu3(hedp)2 (3), where hedp = 1-hydroxyethylidenediphosphonate, have been synthesized and characterized by single-crystal structural analysis. Crystal data: 1, monoclinic, P21/n, a = 6.2137(13) Å, b = 14.747(2) Å, c = 11.1802(12) Å, β = 105.83(2)°, Z = 2; 2, triclinic, P1̄, a = 7.4840(12) Å, b = 8.032(3) Å, c = 10.007(2) Å, α = 111.68(2)°, β = 96.188(14)°, γ = 96.97(2)°, Z = 1; 3, triclinic, P1̄, a = 7.0155(6) Å, b = 8.0904(9) Å, c = 9.2644(11) Å, α = 112.611(13)°, β = 90.819(8)°, γ = 92.824(7)°, Z = 1. The compound 1 is composed of infinite chains with a ladder-type motif. The compounds 2 and 3 adopt a two-dimensional layer structure which contains four- and eight-membered rings assembled from vertex-sharing {CuO4} units and {CPO3} tetrahedra. The magnetic properties of 3 have been investigated.
