Chem. J. Chinese Universities ›› 2022, Vol. 43 ›› Issue (1): 20210576.doi: 10.7503/cjcu20210576

• Article • Previous Articles     Next Articles

Guest-responses of A Porous Coordination Polymer Based on Synergistic Hydrogen Bonds

MO Zongwen1,2, ZHANG Xuewen1, ZHOU Haolong1, ZHOU Dongdong1, ZHANG Jiepeng1()   

  1. 1.MOE Key Laboratory of Bioinorganic and Synthetic Chemistry,School of Chemistry,Sun Yat?Sen University,Guangzhou 510275,China
    2.School of Biotechnology and Health Sciences,Wuyi University,Jiangmen 529000,China
  • Received:2021-08-16 Online:2022-01-10 Published:2021-09-13
  • Contact: ZHANG Jiepeng E-mail:zhangjp7@mail.sysu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21731007)

Abstract:

Solvothermal reaction of Zn(NO32·6H2O, pyrazole-3, 5-dicarboxylic acid (H3pzdc) and 2-amino-1,4-benzenedicarboxylic acid (H2abdc) in NN-dimethylformamide(DMF) produced a porous coordination polymer(Me2NH2)[Zn2(pzdc)(abdc)]·H2O·DMF(1·g, g means guest molecules, H2O and DMF), in which Me2NH2+ was generated from the hydrolysis of the solvent DMF. The 3-dimensional porous coordination framework of 1 can be regarded as a pillared-ribbon structure consisting of parallelly-aligned flat {Zn2(pzdc)}+ ribbons and abdc2- pillars. via desorption/adsorption of solvent molecules, centrosymmetric 1·g can reversibly transform to a chiral framework (Me2NH2)[Zn2(pzdc)(abdc)](1'). Single-crystal X-ray diffraction analyses showed that, based on the competition and cooperation of hydrogen bonds among the host framework, counter cations, and neutral guest molecules, the counter cations underwent significant movement and rotation in the guest-responsive structural transformations, giving rise to the distortion and rotation of the {Zn2(pzdc)}+ ribbon, as well as more than 10% changes of the unit-cell volume and void ratio. Gas adsorption measurements of 1' showed different responses toward N2 and CO2.

Key words: Metal-organic framework, Flexibility, Guest response, Counter ion

CLC Number: 

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