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Updated: Jan 17, 2026
From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
Published on: March 24, 2018
Structure-property relationships in tris(2-amino-5-methylpyridinium) hexabromobismuthate monohydrate with a focus on
Rima Altalib1, Imen Ibrahmi1, Arafet Ghoudi1
1Laboratory of Spectroscopic Characterization and Optical Materials, Faculty of Sciences, University of Sfax BP 1171 3000 Sfax Tunisia arafetghoudi199@gmail.com.
Abstract:
The hybrid compound (C6H9N2)3[BiBr6]H2O was synthesized via slow evaporation and structurally characterized using single-crystal X-ray diffraction. It crystallizes in the monoclinic C2/c space group and adopts a zero-dimensional architecture composed of isolated [BiBr6]3- octahedra, protonated organic cations (C6H9N2)+, and water molecules. These components are interconnected through hydrogen bonding and π-π interactions. Optical absorption measurements reveal a direct band gap of 2.81 eV, confirming the semiconducting nature of the material. Impedance spectroscopy, performed over a frequency range of 0.4 Hz to 3 MHz and a temperature range of 318 K to 363 K, reveals separate contributions from grains and grain boundaries. These were modeled using an equivalent circuit, indicating non-Debye relaxation behavior. The DC conductivity follows an Arrhenius-type behavior with activation energies of 0.96 and 0.51 eV. AC conductivity obeys Jonscher's power law, and the temperature-dependent decrease in the frequency exponent (s) supports the correlated barrier hopping (CBH) mechanism. The material exhibits enhanced dielectric permittivity, suggesting promising potential for optoelectronic and energy storage applications.
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