Assembly of new coordination frameworks in a pH-controlled medium: Syntheses, structures, and properties of (∞)/3[Cd(Hpdc)(H2O)] and (∞)/3[Cd3,(pdc)2(H2O)2]

Long Pan, Xiaoying Huang, Jing Li

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Two 3D cadmium coordination networks (∞)/3[Cd(Hpdc)(H2O)] (1) and (∞)/3[Cd3(pdc)2(H2O)2] (2) have Been synthesized from hydrothermal solutions at 150 °C. Single-phased samples of both compounds can be isolated by adjusting the acidity level of the reactions. Both structures are constructed by a single, multifunctional ligand, 3,5-pyrazoledicarboxylic acid (H3pdc), in different coordination modes. Both 1 and 2 crystallize in the monoclinic crystal system, space group P21/c (No. 14) with a = 6.436(1) Å, b = 12.283(2) Å, c = 8.934(2) Å, β = 104.23(3)°, Z = 4 for 1, and a = 9.744(2) Å, b = 9.821(2) Å, c = 7.496(1) Å, Z = 2 for 2. Both compounds represent new structure types. All metal atoms are seven-fold coordinated in 1 and six-fold coordinated in 2. A comparison is made between the title compounds and related lanthanide series on the coordination habit of the metals and the ligand, as well as the effect of pH on the final products. TGA studies indicate that loss of coordinated water molecules in 1 and 2 occurs at around 213 and 179 °C, respectively, and the decomposition process completes at about 620 and 480 °C for 1 and 2, respectively. (C) 2000 Academic Press.

Original languageEnglish
Pages (from-to)236-246
Number of pages11
JournalJournal of Solid State Chemistry
Issue number1
Publication statusPublished - Jan 1 2000



  • 3,5-pyrazodicarboxylic acid
  • Cadmium compounds
  • Coordination polymers
  • Hydrothermal synthesis

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Inorganic Chemistry
  • Materials Chemistry

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