naphthylpyridinium salts have approximately equal binding affinity to both cyclodextrins. The structures of salt 3 and pseudorotaxane complex 1@β-CD were determined by X-ray diffraction analysis. According to spectral data, pKa of 1 in water is 5.12, which promotes protonation of nitrogen both in the ground state and in the excited state. As a consequence, the fluorescence spectrum exhibits only the protonated
通过吸收研究了4-(2-
萘基)
吡啶(1)在溶液中以及与β-
环糊精(β-CD)和2-羟丙基-β-
环糊精(HP-β-CD)的复合物中的自发和光诱导质子化和荧光光谱。1,其质子化形式2和季
铵化衍
生物高氯酸1-甲基-4-(2-
萘基)
吡啶鎓(3)与β-CD和HP的配合物(log K = 1.5–2.3)的结构和稳定性 通过1 H NMR研究-β-CD 。结果表明,不管溶液的pH值如何,化合物1都存在于
环糊精腔中。HP-β-CD更好地结合1的中性形式
萘基
吡啶鎓盐与β-CD相比,对两个
环糊精的结合亲和力大致相等。盐的结构3和准轮烷络合物1 @β-CD,通过X射线衍射分析来确定。根据光谱数据,对ķ一个的1中的
水是5.12,这促进了氮的质子化无论是在基态和激发态。结果,荧光光谱仅表现出质子化形式,寿命为15 ns。HP-β-CD的除了溶液1分的结果包合物1 @ HP-β-CD; 同时p K a为1降低至4