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首次研究了不同的胺对α-溴代萘(α-BrNp)/β-环糊精(β-CD)体系RTP发射的影响.发现胺能显著增强α-BrNp/β-CD体系的RTP,发射,RTP强度随着胺的烷基链的增长和支链的增加而增加,且当胺的用量是β-CD用量的一倍时,RTP强度最大.由此认为、胺的影响主要应归因于胺分别从β-CD的二端接近,胺的-NH_2基与β-CD的-OH基形成氢键,而其烷基从CD二端折向空腔,封住了CD的上、下端口.这不仅提高了CD腔内的疏水性,增大了发光体与CD间的包结常数,同时,对外部氧向CD腔内的扩散起着隔离作用,显著减小了三线态氧对腔内发光体激发态的猝灭作用.从而可在不除氧的条件下观察到发光体强的RTP,发射,且体系清澈透明.胺的作用属于超分子化学中的分子调控作用.
The effect of different amines on the RTP emission of α-BrNp / β-CD system was first studied and found that amine can significantly enhance the RTP of α-BrNp / β-CD system, RTP intensity increases with increasing alkyl chain length and branching of the amine, and the RTP intensity is greatest when the amine is used in an amount that is double the amount of [beta] -CD. Thus, the effect of the amine is mainly due to As the amine approaches from the two ends of β-CD respectively, the -NH_2 group of the amine forms a hydrogen bond with the -OH group of β-CD and the alkyl group folds from the two ends of the CD into the cavity, This not only increases the hydrophobicity of the CD cavity, increasing the inclusion constant between the emitter and the CD, but also isolates the diffusion of external oxygen into the CD cavity, significantly reducing the triplet oxygen Which quenches the excited state of the luminophores in the cavity and thus can observe the strong RTP of the luminophore under the condition of not deoxygenating and the system emits clear and transparent.The role of the amine belongs to the molecular regulation in the supramolecular chemistry.