期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 124, 期 35, 页码 18901-18910出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpcc.0c05013
关键词
-
资金
- Science and Engineering Research Board (SERB) (DST), New Delhi, India [YSS/2015/000691]
In the present work, a one-dimensional (1D) metal-organic framework, {[Zn-3(TBIB)(2)(Cl)(6)]center dot 11H(2)O}(n) (1), has been synthesized under high temperature and acidic conditions by utilizing the tripodal ligand 1,3,5-tri(1H-benzo [d]imidazol-1-yl)benzene (TBIB). Interestingly, on immersing the single crystals of the synthesized compound 1 in water for similar to 2 days, a single-crystal-to-single-crystal phase transformation occurs, which leads to the formation of a two-dimensional (2D) framework {[Zn-3(TBIB)(2)(Cl)(6)]center dot 6H(2)O}(n) (2). The intense network of H-bonding interactions within the water clusters in the 1D framework was broken in water medium, followed by the formation of strong hydrogen bonds between the coordinated chloride ions and the lattice water molecules in compound 2 possessing a 2D framework. Nevertheless, both the polymers are not only decorated with water clusters but also contain metal- coordinated chloride ions (M-Cl) along with the benzimidazole N atoms in their frameworks, which are expected to assist in the formation of channels for the proton transport. The proton conductivity in both these compounds has been tested using ac impedance spectroscopy from room temperature to 80 degrees C under 3% H2O-H-2 conditions. The 2D framework 2 shows an order of magnitude higher proton conductivity (similar to 1.1 x 10(-4) S cm(-1)) than compound 1 having a 1D framework (1.2 x 10(-5) S cm(-1)) at 25 degrees C. The significant enhancement in the conductivity is attributed to the three-dimensional proton conduction in compound 2, which is not reported earlier.
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