Abstract
The self-assembled Hydrogen−bonded organic frameworks (HOFs) formed by H-bonding between organic linkers were introduced as an exciting type of polymeric porous materials. Here, for the first time, we used sequential conductometry for online monitoring of the self-assembly process as a simple and effective way to find the optimal synthesis ratio of a new HOF. The pentagonal 1,2,4-triazole and the square molecule squaric acid were selected as synthons with different shapes. The obtained structure, [H4C2N3+][HC4O4-] (HOF-1), was revealed by single-crystal X-ray diffraction and further characterized by IR, solid-state UV, and thermogravimetric analysis (TGA). Crystal structure determination shows that HOF-1 crystallizes in monoclinic Cc space group with three-dimensional supramolecular hydrogen-bonded networks via intermolecular O－H⋯O, N－H⋯O, and C－H⋯O interactions. Based on the Electrochemical Impedance Spectroscopy (EIS) results, resistance characteristics of the material after crystallization are significantly reduced, and the dispersion effect is small, indicating that the compound has better uniformity and conductivity after crystallization. By calculation, the electrical conductivity of HOF-1 is excellent at about 10-6 S/cm and can be used as a potential proton conductive material.
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