Yucang Liang, M. Hong, R. Cao
Jul 15, 2002
Citations
0
Influential Citations
35
Citations
Journal
Bulletin of the Chemical Society of Japan
Abstract
The hydrothermal reactions of Ln2O3, Zn(NO3)2·6H2O, pyrazine-2,3-dicarboxylic acid (H2pzdc) and H2O resulted in the formation of three isostructural coordination polymers [Ln2Zn(pzdc)4(H2O)6·2H2O]n (Ln = Gd, 1; Nd, 2; and Sm, 3). The crystal structures of complexes 1 and 2 were determined by X-ray diffraction methods. Compounds 1, 2 and 3 are isomorphous and crystallize in the monoclinic space group P21/n with a = 6.1196(2), b = 22.5318(8), c = 11.9617(1) A, β = 91.766(2), V = 1648.56(8) A3, Z = 2 for 1, a = 6.1644(3), b = 22.6577(12), c = 12.0384(6) A, β = 91.513(2), V = 1680.8(2) A3, Z = 2 for 2. X-ray diffraction analyses confirm that complexes 1 and 2 possess a 3-D brick-like framework structure, each framework being surround by metal atoms, with a size of 16.37×6.12 A, accommodating two water molecules as guests. The Ln(III) ions in compounds 1 to 3 are coordinated by seven oxygen and two nitrogen atoms. In addition, the zinc(II) ions are bonded by two carboxyl oxygen, two nitrogen and two apical car...