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Acta Physico-Chimica Sinca  2017, Vol. 33 Issue (2): 407-412    DOI: 10.3866/PKU.WHXB201611032
ARTICLE     
Chiral Luminescent Liquid Crystal Material Based on Europium-Substituted Polyoxometalate
Hong YUAN1,3,Jing ZHANG1,*(),Xue-Hong WEI3,*(),Hui-Min FANG3,Shi-Fang YUAN1,Li-Xin WU2,*()
1 Institute of Applied Chemistry, Shanxi University, Taiyuan 030006, P. R. China
2 State Key Laboratory of Supramolecular Structure and Materials, Jilin University, Changchun 130012, P. R. China
3 College of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, P. R. China
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Abstract  

The incorporation of europium-substituted polyoxometalate (PM) into chiral amphiphiles is attractive for the fabrication of multifunctional chiral luminescent liquid crystalline materials. Chiral amphiphiles acted as good promoters to trigger the achiral PM to show induced supramolecular chirality through electrostatic interactions, as illustrated by circular dichroism (CD) spectra. Differential scanning calorimetry (DSC), polarized optical microscopy (POM), and temperature-dependent X-ray diffraction (XRD) analysis confirmed that the organic/inorganic hybrid polyoxometalate complex exhibited thermotropic mesomorphic behaviors. In a cast film, the complex displayed intrinsic luminescence that could be adjusted by accurately controlling the temperature. The electrostatic encapsulation of PM with chiral mesomorphic promoters provides an effective method for constructing PM-based chiral luminescent liquid crystalline materials.



Key wordsPolyoxometalate      Optical activity      Liquid crystal      Luminescence      Supramolecular selfassembly      Surfactant     
Received: 23 September 2016      Published: 03 November 2016
MSC2000:  O644  
Fund:  the National Key Basic Research Program of China (973)(2013CB834503);National Natural Science Foundation of China(21502107,21574057,21101101);Natural Science Foundation of Shanxi Province, China(2014021019-5);Scientific Research Start-up Funds of Shanxi University, China(020451801001);Scientific and Technological Innovation Programs of Higher Education Institutions in Shanxi Province, China(2016118);National Training Programs of Innovation and Entrepreneurship for Undergraduates, China and Scientific Instrument Center of Shanxi University, China(201610108010)
Corresponding Authors: Jing ZHANG,Xue-Hong WEI,Li-Xin WU     E-mail: jingzhang@sxu.edu.cn;xhwei@sxu.edu.cn;wulx@jlu.edu.cn
Cite this article:

Hong YUAN,Jing ZHANG,Xue-Hong WEI,Hui-Min FANG,Shi-Fang YUAN,Li-Xin WU. Chiral Luminescent Liquid Crystal Material Based on Europium-Substituted Polyoxometalate. Acta Physico-Chimica Sinca, 2017, 33(2): 407-412.

URL:

http://www.whxb.pku.edu.cn/10.3866/PKU.WHXB201611032     OR     http://www.whxb.pku.edu.cn/Y2017/V33/I2/407

Fig 1  Structural illustration of CS-Eu
Fig 2  (a) CD and (b) UV/Vis spectra of CS-Eu,(c) CD and (d) UV/Vis spectra of CS casting film on quartz substrate
Fig 3  Grain texture of CS-Eu at 30 ℃ on the cooling run
Fig 4  (a) Temperature-dependent XRD patterns of CS-Eu on heating runs,and (b) temperature dependence of the positions of IR bands of antisymmetrical and symmetrical CH2 stretching mode of CS-Eu
Fig 5  Schematic drawing of packing model of CS-Eu in the mesophase at 30 ℃
Fig 6  (a) Photographs of CS-Eu under daylight (top) and under the irradiation of 254 nm light (bottom),(b) emission spectrum of CS-Eu casting film on quartz substrate (λex = 254 nm),and (c) variable-temperature emission spectra of CS-Eu
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