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Download fileHigh 3D Proton Conductivity of a 2D Zn(II) Metal–Organic Framework Synthesized via Water-Assisted Single-Crystal-to-Single-Crystal Phase Transformation
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posted on 24.08.2020, 19:35 authored by Rashmi A. Agarwal, Amit Das, Shobit OmarIn
the present work, a one-dimensional (1D) metal–organic
framework, {[Zn3(TBIB)2(Cl)6]·11H2O}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 ∼2
days, a single-crystal-to-single-crystal phase transformation occurs,
which leads to the formation of a two-dimensional (2D) framework {[Zn3(TBIB)2(Cl)6]·6H2O}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 °C under 3% H2O–H2 conditions. The 2D framework 2 shows an order of magnitude higher proton conductivity (∼1.1
× 10–4 S cm–1) than compound 1 having a 1D framework (1.2 × 10–5 S cm–1) at 25 °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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Keywords
compound 1compound 2ac impedance spectroscopyprotonWater-Assisted Single-Crystal-to-Si...conductivity1 D frameworkZnwater clustersmetal-coordinated chloride ionsHigh 3 D Proton Conductivitylattice water moleculesbenzimidazole N atoms2 D frameworkTBIB2 D framework 2single-crystal-to-single-crystal ph...