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本文研究了不同链长的β-萘甲酸烷基酯(A_n)在乙二醇-水(EG-H_2O)和二甲基砜-水(DMSO-H_2O)混合溶剂中的荧光光谱,以及添加物(无机盐、长链饱和烷烃、糖淀粉)对A_n荧光的影响.长链A_n在混合溶剂中很容易形成激基缔合物,表明疏水作用促使长链分子相互簇集.测定了不同链长的分子发生簇集的临界浓度和临界溶剂组成.分别添加长链烷烃和糖淀粉都能引起激基缔合物的荧光强度减弱和单体荧光强度的增强,表明A_n和长链烷烃共簇集,与糖淀粉形成包结物.研究了在簇集体中A_n形成激基缔合物的动力学和热力学,测定了激基缔合物形成和解离速率常数、活化能和热焓的变化.证明在簇集体中基态发色基团之间并不具有激基缔合物的构型.在一定温度下,簇集体会发生相变.
In this paper, the fluorescence spectra of β-naphthoic acid alkyl esters with different chain lengths (A_n) in a mixed solvent of ethylene glycol-water (EG-H_2O) and dimethylsulfone-water (Inorganic salts, long-chain saturated alkanes, starch) on the fluorescence of A_n.The long chain A_n is easy to form excimer in the mixed solvent, indicating that the hydrophobic interaction causes the long-chain molecules to cluster with each other. Of the molecular cluster concentration of the critical concentration and critical solvent composition.Add long chain alkanes and starch, respectively, can cause the excimer fluorescence intensity and monomer fluorescence intensity enhancement, indicating A_n and long-chain paraffin cluster , And the formation of inclusion complex with starch.Studies on the kinetics and thermodynamics of the formation of exciplexes of A_n in clusters and the determination of the rate constants, activation energy and enthalpy changes of exciplex formation and dissociation In the cluster, the ground state chromophores do not have the excimer configuration, and at a certain temperature, the cluster undergoes phase transition.