Template-Directed One- and Two-Dimensional Copper(II) Diphosphonates:  Structures and Characterizations of (NH₄)₂Cu₃(hedp)₂(H₂O)₄, [NH₃(CH₂)₄NH₃]Cu₃(hedp)₂·2H₂O, and [NH₂(C₂H₄)₂NH₂]Cu₃(hedp)₂ (hedp = 1-Hydroxyethylidenediphosphonate)

Abstract

Three new copper(II) diphosphonates, (NH(4))(2)Cu(3)(hedp)(2)(H(2)O)(4) (1), [NH(3)(CH(2))(4)NH(3)]Cu(3)(hedp)(2).2H(2)O (2), and [NH(2)(C(2)H(4))(2)NH(2)]Cu(3)(hedp)(2) (3), where hedp = 1-hydroxyethylidenediphosphonate, have been synthesized and characterized by single-crystal structural analysis. Crystal data: 1, monoclinic, P2(1)/n, a = 6.2137(13) Å, b = 14.747(2) Å, c = 11.1802(12) Å, beta = 105.83(2) degrees, Z = 2; 2, triclinic, P&onemacr;, a = 7.4840(12) Å, b = 8.032(3) Å, c = 10.007(2) Å, alpha = 111.68(2) degrees, beta = 96.188(14) degrees, gamma = 96.97(2) degrees, Z = 1; 3, triclinic, P&onemacr;, a = 7.0155(6) Å, b = 8.0904(9) Å, c = 9.2644(11) Å, alpha = 112.611(13) degrees, beta = 90.819(8) degrees, gamma = 92.824(7) degrees, 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 {CuO(4)} units and {CPO(3)} tetrahedra. The magnetic properties of 3 have been investigated.