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中文摘要：
螺吡喃分子有两种同分异构体,一种是无色闭环的螺吡喃结构,另一种是有色开环的部化青结构。在螺吡喃分子上共轭桥连荧光素基团,构成一种双官能团融合分子,可以加强螺吡喃分子的荧光发射。这种分子可以形成很多构型构像,而只有两者完全共轭连接的构型构像才能增加分子的荧光强度。为了证明这种完全共轭构型构像的存在,本文利用时间分辨超快光谱技术来研究这种双官能团融合分子的性质。通过测试其瞬态吸收光谱以及稳态荧光的激发谱,发现在这种融合分子中,荧光素基团对螺吡喃的荧光起到了一定的增强作用,说明在这种融合分子中存在这种双官能团完全共轭的构型构像。
英文摘要：
The spiropyran has two tautomers,the ring-closed spiropyran form(SP) and the ringopened merocyanine form(ME).In order to get more applications,the fluorescence of spiropyran needs to be enhanced.To produce a fused bifunctional molecule with full conjugated configuration and conformation,we synthesized a fused molecule with both functional groups of spiropyran and fluorescein.There exist many kinds of configuration and conformation in these molecules,but only the conjugated one makes sense.Femtosecond transient absorption ultrafast spectroscopy is used to characterize this fused molecule.The experiments demonstrate that there is a part of fully conjugated configuration and conformation,which can enhance the fluorescence intensity.
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