Synthesis and Characterization of a Chiral 3D-Framework Material: <i>d</i>-Co(en)₃[H₃Ga₂P₄O₁₆]

Abstract

A chiral material, d-Co(en)3[H3Ga2P4O16] (en = 1,2-diaminoethane), with a three-dimensionally connected framework has been prepared hydrothermally, using optically pure d-Co(en)33+ as a structure directing agent, and the structure characterized by X-ray diffraction. Aluminum-containing analogues of this material have also been synthesized. The material can be thought of as a diamondlike network, consisting of tetrahedrally coordinated gallium sites linked by doubly bridging phosphates, with the metal complex sitting in the interstices. Co(C2N2H8)3[H3Ga2P4O16], Mr = 761.56, monoclinic, I2, a = 9.580(2)Å, b = 12.6789(5)Å, c = 9.9631(6)Å, β = 97.85(2)°, Z = 2, ρcalc = 2.109 g cm-3, ρobs = 2.11 g cm-3, Cu Kα, RF = 0.032. Co(C2N2H8)3[H3Ga1.25Al0.75P4O16], Mr = 729.51, monoclinic, I2, a = 9.567(1)Å, b = 12.6923(5)Å, c = 9.9241(5)Å, β = 97.601(8)o, Z = 2, ρcalc = 2.028 g cm-3, ρobs = 2.08 g cm-3, Cu Kα, RF = 0.026.