Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (12): 20230389.doi: 10.7503/cjcu20230389

• Physical Chemistry • Previous Articles     Next Articles

Color Tunable Rare-earth Containing Supramolecular Gels with Improved Luminescent Properties Assembled in a Deep Eutectic Solvent

LEI Nana1(), YANG Shouye1, FAN Liming1(), CHEN Xiao2()   

  1. 1.School of Chemistry and Chemical Engineering,North University of China,Taiyuan 030051,China
    2.Key Laboratory of Colloid and Interface Chemistry,Ministry of Education,Shandong University,Jinan 250100,China
  • Received:2023-09-01 Online:2023-12-10 Published:2023-10-23
  • Contact: LEI Nana, FAN Liming, CHEN Xiao E-mail:leinana2012@126.com;limingfan@nuc.edu.cn;xchen@sdu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(21673129);the Shanxi Province Science Foundation for Youths, China(201901D211272)

Abstract:

In this paper, a kind of environmentally friendly deep eutectic solvent(ChU) was obtained from chloline chloride and urea with a molar ratio of 1∶2. As a low molecular weight gelator, sodium deoxycholate(NaDC) could form gel in ChU with a mass fraction even as low as 1%. With increasing NaDC concentration in ChU, such clear gel gradually became cloudy and then opaque, accompanied with the increasing mechanical strength revealed by rheological testing. The NaDC/ChU gel was formed by densely packed fiber aggregates with tens of microns in length under optical microscopic observations. The well-designed rare-earth complexes, i.e. [choline]3[Ln(dpa)3](Ln-dpa, Ln=Eu3+, Tb3+, dpa=2,6-pyridinic acid) were fabricated, which had the same cationic group with ChU and excellent luminescent properties. Then, color tunable supramolecular gels were constructed through doping Eu-dpa or Tb-dpa into NaDC/ChU gels. The results showed that the introduction of deep eutectic solvent as well as the effective isolation and binding of gel matrix greatly improved the photophysical properties of such supramolecular gels compared with other solvent systems or powder states. This work develops a simple and universal strategy to prepare color tunable rare-earth containing supramolecular gel soft materials with highly luminescent efficiency and is also the first attempt in deep eutectic solvent.

Key words: Deep eutectic solvent, Self-assembly, Rare-earth complex, Luminescent gels, Sodium deoxycholate

CLC Number: 

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