Acta Phys. -Chim. Sin. ›› 2012, Vol. 28 ›› Issue (08): 1815-1822.doi: 10.3866/PKU.WHXB201206123

• THERMODYNAMICS, KINETICS, AND STRUCTURAL CHEMISTRY • Previous Articles     Next Articles

Crystal Structures and Pore Stability of Coordination Polymers Constructed by Nicotinic Acid and Isonicotinic Acid with Co(II)

HUA Xiao-Hui, LI Wei-Hong, XU Yi-Zhuang, WU Jin-Guang   

  1. College of Chemistry and Molecular Engineering, Peking University, Beijng 100871, P. R. China
  • Received:2012-05-18 Revised:2012-06-12 Published:2012-07-10
  • Contact: LI Wei-Hong E-mail:Weihong.Li@pku.edu.cn
  • Supported by:

    The project was supported by the National Natural Science Foundation of China (20671007).

Abstract:

Nicotinic acid and isonicotinic acid were utilized to react with Co(NO3)2 in N,N'- dimethylformamide (DMF) in solvothermal conditions respectively, and resulted in three new coordination polymers: [Co22-H2O)(nicotinic acid)4·(DMF)] (1), [Co2(isonicotinic acid)4·(DMF)] (2), and [Co(isonicotinic acid)2·(DMF)] (3). Single crystal X-ray diffraction (XRD) and elemental analysis were performed to obtain structural information on these compounds. Fourier transform infrared (FTIR) spectroscopy, thermogravimetric analysis (TGA), and N2 isotherm analysis were utilized to investigate the pore stability of the three compounds. The above experiments reveal that compound 1 has a diamond-like topology, and the one-dimensional (1D) channels in compound 1 are stable after the removal of DMF molecules. Compounds 2 and 3 were synthesized at 100 and 160 °C by the coordination of isonicotinic acid with Co(II), respectively. The coordination modes of isonicotinic acid to Co(II) are completely different in the two compounds, which lead to two different crystal structures. The 1D channels in compounds 2 and 3 were not stable after the removal of DMF molecules.

Key words: Coordination polymer, Nicotinic acid, Crystal structure, Topology, Fourier transform infrared spectroscopy, Pore stability

MSC2000: 

  • O641