Chem. J. Chinese Universities ›› 2021, Vol. 42 ›› Issue (3): 902.doi: 10.7503/cjcu20200538

• Polymer Chemistry • Previous Articles     Next Articles

Highly Solvatochromic Terpyridine Compounds for Identification of Butanol Isomers

CHANG Hui1, YAO Shuangquan2, HAN Wenjia3, KANG Xiena4, ZHANG Li4, LI Xinping4, ZHANG Zhao4,5()   

  1. 1.College of Mechanical and Electrical Engineering,Shaanxi University of Science and Technology,Xi’an 710021,China
    2.Guangxi Key Laboratory of Clean Pulp & Papermaking and Pollution Control,College of Light Industry and Food Engineering,Guangxi University,Nanning 530004,China
    3.State Key Laboratory of Biobased Material and Green Papermaking,Qilu University of Technology,Shandong Academy of Sciences,Jinan 250353,China
    4.College of Bioresources Chemical and Materials Engineering,National Demonstration Center for Experimental Light Chemistry Engineering Education,Shaanxi Provincal Key Laboratory of Popermaking Technology and Specialty Paper Development,Shaanxi University of Science and Technology,Xi’an 710021,China
    5.State Key Laboratory of Pulp and Paper Engineering,South China University of Technology,Guangzhou 510640,China
  • Received:2020-08-07 Online:2021-03-10 Published:2021-03-08
  • Contact: ZHANG Zhao E-mail:zhangzhaoqg@sust.edu.cn

Abstract:

NN-Dimethyl functional group was introduced into the terpyridine molecule to realize the locally excited state luminescence of the terpyridine molecule. It was found that the polarity of the solvent induced a change in the dipole moment of terpyridine, achieving solvent-induced fluorescence discoloration from deep blue light(λmax=384 nm) to yellow light(λmax=558 nm). As the fluorescence of terpyridine is easily quenched by the oscillation of —OH group in alcohol solvent, the n-butanol, iso-butanol, sec-butanol and tert-butanol solvents with different steric hindrances make the light color of terpyridine close, while the luminous intensity difference is greater. The terpyridine is further coordinated with ZnCl2 to obtain the terpyridine-Zn(Ⅱ) complex. The coordination of the metal ion Zn(Ⅱ) promotes the charge transfer within the terpyridine molecule. Since the NN-dimethyl functional group, as the electron donor can undergo plane distortion, the butanol isomers can adjust the locally excited and twisted intramolecular charge transfer of terpyridine-Zn(Ⅱ), and then realize the adjustment of its light color in butanol isomer solvent. Terpyridine and terpyridine-Zn(Ⅱ) have good solvent-induced fluorescence discoloration properties, and can be used to identify four butanol isomers.

Key words: Solvatochromism, Terpyridine, Butanol isomers identification, Local excitation, Twisted intramolecular charge transfer

CLC Number: 

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