Homochiral metal-organic coordination networks from L-typtophan

Three homochiral metal-organic coordination networks [Co-2(L-Trp)(2)(Py)(6)].Py . (ClO4)(2) (1), [Ni(L-Trp)(Py)(3)] . H2O . ClO4 (2) and [Co-2(L-Trp)(INT)(2)(H2O)(2)(ClO4)] (3), all containing natural amino acid L-HTrp (L-typtophan), were hydrothermally synthesized and structurally characterized. The compounds I and 2 crystallize in the orthorhombic space group C222(t), with a = 10.731(2) angstrom, b = 19.709(4) angstrom, c = 27.365(6) angstrom and Z = 4 for 1 and a = 10.710(10) angstrom, b = 20.088(18) angstrom, c = 27.63(3) angstrom and Z = 8 for 2, respectively. The compound 3 has the monoclinic space group P2(1), with a = 8.1934(14) angstrom, b = 13.209(2) angstrom, c = 12.464(2) angstrom, beta = 104.107(3)degrees and Z = 2. Both 1 and 2 consist of 1D helical chains. Compound 3 is composed of 2D networks, which further assemble into a 3D supramolecular structure via weak interlayer interactions. The optically pure amino acid L-HTrp plays an important role leading to homochiral structures reported here. (c) 2006 Elsevier B.V. All rights reserved.