The Synthesis, Structure, and Dielectric Properties of a One-Dimensional Hydrogen-Bonded DL-α-Phenylglycine Supramolecular Crown-Ether-Based Inclusion Compound

Author:

Liu Yang123,Hu Hongzhi1,Qi Huanhuan1,Lv Meixia1,Liu Zunqi123

Affiliation:

1. Chemistry and Chemical Engineering College, Xinjiang Agricultural University, Urumqi 830052, China

2. Xinjiang Sub-Center, National Engineering Research Center of Novel Equipment for Polymer Processing, Urumqi 830052, China

3. Xinjiang Key Laboratory of Agricultural Chemistry and Biomaterials, Urumqi 830052, China

Abstract

A novel hydrogen-bonded supramolecular crown-ether-based inclusion compound, [(DL-α-Phenylglycine)(18-crown-6)]+[(CoCl4)0.5]−(1), was obtained via evaporation in a methanolic solution at room temperature using DL-α-phenylglycine, 18-crown-6, cobalt chloride (CoCl2), and hydrochloric acid. Its structure, thermal properties, and electrical properties were characterized via elemental analysis, single-crystal X-ray diffraction, variable-temperature infrared spectroscopy, thermogravimetric analysis, differential scanning calorimetry, and variable temperature–variable frequency dielectric constant testing. The compound was a monoclinic crystal system in the C2 space group at low temperature (100 K) and room temperature (293 K). Analysis of the single crystal structure showed that [(CoCl4)0.5]− presented an edge-sharing ditetrahedral structure in the disordered state, while the protonated DL-α-phenylglycine molecule in the disordered state and intramolecular hydroxyl group (-OH) underwent dynamic rocking, causing a significant stretching motion of the O-H···Cl-type one-dimensional hydrogen bond chain. This resulted in dielectric anomalies in the three axes of the crystal, thus showing significant dielectric anisotropy.

Funder

General Program of the Natural Science Foundation of Xinjiang Uygur Autonomous Region

Key Research and Development Projects of the Xinjiang Uygur Autonomous Region

National Natural Science Foundation of China

Xinjiang “Tianshan talent plan” project

Student Entrepreneurship Training Program of Xinjiang Agricultural University

Student Innovation Project of Xinjiang Agricultural University

Publisher

MDPI AG

Subject

Chemistry (miscellaneous),Analytical Chemistry,Organic Chemistry,Physical and Theoretical Chemistry,Molecular Medicine,Drug Discovery,Pharmaceutical Science

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