Hydrothermal synthesis, structures and characterization of two new copper(II) triphosphonate compounds.

Two copper(II) triphosphonate compounds, Cu[(APTPH4)(phen)(H2O)] · 2.16H2O (1) and [Cu(APTPH4)(2,2'-bipy)(H2O)] · 2.63H2O (2), have been prepared by a low temperature hydrothermal reaction from 1-aminopropane-1,1,3-triphosphonic acid (APTPH6), CuO and a second ligand, phen = 1,10-phenanthroline, or 2,2'-bipy = 2,2'-bipyridyl. These two compounds were characterized by single crystal X-ray diffraction, elemental analysis, IR and TG. Crystal data for 1: Monoclinic, space group P21/c, a = 14.4830(7) Å, b = 9.1721(5) Å, c = 16.7403(8) Å, β = 90.101(2)°. For compound 2: Triclinic, space group P1, a = 7.1215(7) Å, b = 10.460(2) Å, c = 14.671(2) Å, α = 82.983(2)°, β = 83.882(2)°, γ = 80.617(2)°. In both compounds, each Cu2+ ion is five-coordinate with two oxygen atoms from the triphosphonate, two nitrogen atoms from the second ligand and one water molecule, to form a distorted square-pyramidal geometry. Both complexes have 3D supramolecular structures constructed by hydrogen bonds and π-π stacking interactions. [ABSTRACT FROM AUTHOR]