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. 2016 Mar 8;6:22928. doi: 10.1038/srep22928

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(a) The scheme of photoisomerization of azo-NDI trans to cis and back using 366 nm and 500 nm respectively. (b) The kinetic evolution of cis isomer from trans during UV irradiation at 366 nm and accompanied color change in the solution. (c) The fluorescence spectra of cis and trans azo-NDI. (d) The absorption of evolution of cis- to trans-azo-NDI induce by irradiation at 500 nm visible light monitored using UV-vis spectroscopy.