Abstract:

Hydrogen-bonded organic frameworks (HOFs) is one of the new types of crystalline solid materials composed by organic building units through the intermolecular hydrogen bond (H-bond). They have attracted great attention in the field of proton conduction due to their characteristics of high crystallinity, adjustable pore size, low density, abundant and dense H-bonds. In line with the current research frontier, we prepared benzotriazolyl acetic acid-based hydrogen-bonded organic framework (HOF 1) through one-step method in water and determined its composition and structure by means of elemental analysis, infrared spectrum and powder X-ray diffraction. Then, its proton conductivity was measured at three relative humidity (75%, 85% and 98% RHs) and different temperature (60?100 ℃) by alternating current impedance method. The proton conduction mechanism can be deduced by calculation of activation energy. This chemistry experiment is appropriate in difficulty and its testing methods are diversified, which enables the students to know a scientific research frontier, improve their interests in scientific research and stimulate their enthusiasm for scientific research, thus increase their confidence in scientific research in the future.

Key words: Hydrogen-bonded organic framework, Benzotriazolyl acetic acid, Green chemistry, Proton conduction, Comprehensive chemistry experiment