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Chinese Journal of Materials Research  2016, Vol. 30 Issue (10): 731-736    DOI: 10.11901/1005.3093.2015.703
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Preparation, Characterization and Property of an Azo Dye and Its Doping Film
Xiumei SONG1,2,Zongcai FENG1,2,**(),Jiuying FENG1,2,Cuijuan FENG1,Bing HAN1
1. School of Chemistry and Chemical Engineering, Lingnan Normal University, Zhanjiang 524048, China
2. Development Center for New Materials Engineering & Technology in Universities of Guangdong, Zhanjiang 524048, China;
Cite this article: 

Xiumei SONG,Zongcai FENG,Jiuying FENG,Cuijuan FENG,Bing HAN. Preparation, Characterization and Property of an Azo Dye and Its Doping Film. Chinese Journal of Materials Research, 2016, 30(10): 731-736.

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Abstract  

An azodye, 3', 5'-dibromo-4-(N, N-dimethyl)aminoazobenzene was synthesized and characterized by IR, NMR, ESI-MS, element analysis and single-crystal X-ray diffraction. Then the azo dyedoped polymethyl methacrylate film was prepared by host-guest doping method. The photoisomerization properties the doped polymethyl methacrylate both in liquid and solidstates were studied by UV-Vis spectrum and fluorescence spectrum. Additionally, the thermostability of azodyewas characterized by TG. The results show that the molecule of azodye crystal exists as trans-isomer, the benzene rings and -N=N- are nearly coplanar. And the azodye both in solvent and film display significant photoisomerization property, with the process describing as the first order kinetics reaction. The fluorescence intensity of the trans-isomer is stronger than that of the cis-isomer. The azodye is stable below 250℃.

Key words:  organic polymer materials      azodye      photoisomerization      rate constant      crystal      polymethyl methacrylate     
Received:  04 December 2015     
Fund: *Supported by National Natural Science Foundation of China No. 51403183 and Science and Technology Project of Zhanjiang Nos. 2014B01031 & 2015A02008.

URL: 

https://www.cjmr.org/EN/10.11901/1005.3093.2015.703     OR     https://www.cjmr.org/EN/Y2016/V30/I10/731

Fig.1  The synthetic route and photoisomerization process of the azo dye
Fig.2  Molecular structure of the azo dye crystal
Fig.3  1H NMR spectra of azo dye in CDCl3 before and after λ405 light irradiation
Fig.4  Time-dependent change of absorption spectra of azo dye in ethyl acetate (a: λ405, b: λ365)
Fig.5  Time-dependent change of absorption spectra of doped azo dye PMMA film upon λ405 light irradiation
Fig.6  The first-order plots of photoisomerization of azodye in solvent and PMMA
Fig.7  Fluorescence spectra of azo dye in different solvents
Solvents Dichlomethane Tetrahydrofuran Acetone Acetonitrile N,N-dimethyl formamide Dimethyl sulfoxide
λem/nm 519 521 526 533 536 541
Table 1  The fluorescence spectra of azo dye in different polar solvents
Fig.8  Time-dependent change of fluorescence spectra of azodye in (a) dichloromethane and (b) PMMA film upon UV irradiation
Fig.9  TG curve of the azodye
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