Promising Ultraviolet Absorbers—Novel Guanine Analogs Having Significantly Improved Ultraviolet Absorption Capacity and Dissipating the Energy of Absorbed Photons by Nonradiative Decay Mechanism |
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Authors: | HAN Song-zhe WU Yu-ting ZHANG Meng JIAO Jia-jun |
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Institution: | School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai 200237, P. R. China |
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Abstract: | Structural properties of nucleobase underlie their ultrafast excited-state dynamics and low fluorescence quantum yields, which cause effectively nonradiative decay process and render them like sunscreens. Thus, eight guanine analogsN-2-(2'-nitrobenzoyl)-guanine, N-2-(3'-nitrobenzoyl)-guanine, N-2-(4'-nitrobenzoyl)-guanine, N-2-(2'-hydroxybenzoyl)-guanine, N-2-(4'-methoxylbenzoyl)-guanine, N-2-(4'-chloricbenzoyl)-guanine, N-2-(4'- methylicbenzoyl)- guanine and N-2-(3',5'-dinitrobenzoyl)-guanine] with different substituted benzoyls, except N-2-(4'-chloricbenzoyl)-guanine, were newly synthesized. In contrast with guanine, they exhibit wider ultraviolet absorbent range, higher molar extinction coefficient and lower fluorescence intensity. |
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Keywords: | Guanine Ultraviolet absorber Acidamide |
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