Catalyst-free copolymerization of ethyl diazoacetate（EDA） with carbethoxycarbene（CEC） has been achieved through two approaches：microwave irradiation and enzyme-assisted（Novozyme-435）system.The structure of the copolymer was characterized by MALDI-TOF MS（m/z from 2000 to 2450）,which suggested that the main chain of the copolymer consisted of-CH（COOEt）- and-N=NCH（COOEt）- frameworks.Fourier transform infrared（FT1R） spectrometry,elemental analysis,and Raman spectrometry proved the incorporation of azo group in the copolymer.The results indicated that the CEC radicals were generated under microwave irradiation（with or without Novozyme-435） from EDA.The mechanism study described that the generation speed of CEC radical was faster than its polymerization,and the excess CEC radicals improved the activity of the N2C1 group,thus inducing some EDA molecules as radicals.The two kinds of radicals co-coupled to result in poIy（CEC-co-EDA） through the C1/N2C1 copolymerization,but the homopolymerization of CEC radical occurred quicker than its cocoupling with activated EDA.
Long-Qiang XiaoXiang-Xiang JiaLi-Qiong LiaoLi-Jian Liu
Conventionally, each fluorophore is only clarified with the wavelength of incident beam shorter（down-conversion） or longer（up-conversion） than that of emission light. However, three anthracenes presented in this paper are the wavelength-focused（WF） molecules which can shift the portions of shorter and longer wavelengths of incident light into an identical wavelength in between. UV（ultraviolet） and NIR（near infrared） portions of Xenon light-simulated solar spectrum are focused into visible light with maximum wavelengths ranging from 415 to 471 nm through the two-way photoluminescence of the three anthracenes（anthracene（AN）, fluoranthene（FLA） and 9, 10-diphenylanthracene（DPA））. At the same time, the intensity of the visible light is two times as that of excitation light. Besides, DPA dissolved in different solvents shows excellent fluorescence features. The results present great potential for applications in enhancing the intensity of solar spectrum at visible region and utilizing more portions of sunlight with solar cell.
