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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 analogs[N-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.
Structural properties of nucleobase underlie their ultrafast excited-state dynamics and low fluorescence quantum yields, which causes effectively nonradiative decay process and render them like sunscreens.Thus, eight guanine analogs [N-2- (2’-nitrobenzoyl) -guanine, N- 2- (3’-nitrobenzoyl) -guanine, N-2- (4’-nitrobenzoyl) -guanine, N-2- 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 were characterized for higher ultraviolet extinction coefficient, higher molar extinction coefficient and lower fluorescence intensity.