Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (3): 691.doi: 10.7503/cjcu20200594

• Inorganic Chemistry • Previous Articles     Next Articles

Synthesis, Structure and Dielectric Properties of One-dimensional Chain Hydrogen Glycine Supramolecular Compound [(Gly)2+(18-crown-6)2(MnCl42

WANG Le, QIN Liulei, LIU Yang(), REN Li, XU Huiting, LIU Zunqi()   

  1. Chemical Engineering College,Xinjiang Agricultural University,Urumqi 830052,China
  • Received:2020-08-24 Online:2021-03-10 Published:2021-03-08
  • Contact: LIU Yang,LIU Zunqi E-mail:liuyangxj85@163.com;zunqi85@163.com
  • Supported by:
    ? Supported by the National Natural Science Foundation of China(21561030);the Postgraduate Scientific Research Innovation Project of Xinjiang Uygur Autonomous Region, China(XJ2020G162)

Abstract:

A new phase transition one-dimensional chain hydrogen-bonding glycine supramolecular [(Gly)2+(18-crown-6)2(MnCl42?](1) was prepared by evaporation method with the reaction of glycine(Gly), 18-crown-6, transition metal compound MnCl2 and hydrochloric acid. Compound 1 was characterized and analyzed by means of elemental analysis, variable temperature X-ray single crystal diffraction and dielectric constant measurements. The results showed that crystal of the title complex belonged to monoclinic crystal system, space group changed from P21/c(100 K, low temperature) to C2/c(293 K, room temperature). [MnCl42? anion displayed a double tetrahedral structure with common edges in a disordered state with the temperature increasing. Dynamic oscillations occured between the protonated glycine molecule and the intramolecular hydroxyl group(—OH), and built one-dimensional O—HCl hydrogen bonds chain with obvious stretching motion. These caused the structural phase transition and dielectric anomaly of compound 1 in a certain temperature range.

Key words: Hydrogen bond, Molecular swing, Metal complex, Structural phase transition, Stepped dielectric anomaly

CLC Number: 

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