【摘要】 本文研究了双-β-萘甲酸多亚甲基二醇酯（B_n）在二甲基亚砜-水（DMSO-H₂O）和乙二醇-水（EG-H₂O）两种混合溶剂中的稳态和时间分辨荧光光谱以及温度、溶剂组成对荧光光谱的影响.发现疏水作用使B₃、B₄、B₅和B₁₀的两个发色团在基态时相互重叠,因此被激发时,很容易形成分子内激基缔合物.B₂的激基缔合物中,两个亚甲基为顺叠式构象,在基态时两个发色团只能相互靠近.以减小排斥能.受激后,两个发色团需稍作运动,才能形成激基缔合物,测定了B₂激基缔合物形成的动力学和热力学参数,并和β-萘甲酸酯发色团形成分子间激基缔合物的参数进行了比较.更多还原

【Abstract】 The fluorescence properties of polymethylene bis-β-naphthoates with different chain length（B_n） in poor solvents such as dimethyl sulfoxide-water（DMSO-H₂O） and ethylene glycol-water（EG-H₂O） were measured under stationary and nonstaionary conditions at various temperatures. Hydrophobic interactions bring the two chromophores of B₃, B₄, B₅ and B₁₀ into a sandwith arrangement in ground state, thus promote intramolecular excimer formation upon excitation. The perfect overlapping Structure for B₂ can not be formed in ground state because of the eclipsed conformation of two methylene groups in such a sandwich arrangement. The favorable conformation for B₂ is the structure in which the two naphthyl rings are in proximity. The activation energy, enthalpy and entropy changes for excimer formation of B₂ were calculated from the fluorescence decay parameters.更多还原