磁场效应对羟丙基-β-环糊精/芘体系I_1/I_3值的影响  

Magnetic Field Effects on I_1/I_3 of Pyrene in the Presences of Hydroxypropyl-β-cyclodextrin by Fluorescent Probe

作　　者：肖翔[1] 任锋[2] 朱亚先[3] 张勇[1] 

机构地区：[1]近海海洋环境科学国家重点实验室(厦门大学)厦门大学环境科学研究中心,福建厦门361005 [2]华侨大学环境保护设计研究所,福建泉州362021 [3]厦门大学化学化工学院化学系,福建厦门361005

出　　处：《厦门大学学报（自然科学版）》2007年第4期534-537,共4页Journal of Xiamen University：Natural Science

基　　金：国家自然科学基金(20577037)资助

摘　　要：利用荧光探针法,通过考察磁场作用下有无单-[2-氧-(2-羟丙基)]-β-环糊精(HPCD)的水溶液中芘(Py)的荧光强度和I1/I3值的变化,研究了外加磁场效应(MFE)对HPCD/Py相互作用的影响.结果表明:MFE可使水溶液中Py的荧光强度增强,但使其I1/I3值增大.在一定的温度条件下,一方面MFE使HPCD/Py体系中Py分子取向改变,使得暴露于水中的Py分子的表面积增加,削弱了HPCD和Py之间的疏水相互作用;另一方面MFE使Py分子激发三重态的布居增加,使Py的极性增大,疏水相互作用减弱,从而导致HPCD/Py的包络程度减小.A novel fluorescent probe method for studying the magnetic field effects （MFE） on the interaction between pyrene （Py） and mono-[-2-O-（2-hydroxypropyl）]-β-cyclodextrin （HPCD） was established. The differences of fluorescence intensity and I1/I3 value of dissolved Py in aqueous and HPCD aqueous solution in the presence of magnetic field were investigated, respectively. It was found that the fluorescence intensity of Py in aqueous solution was increased within the presence of MFE. However, I1/I3 value of dissolved Py in HPCD aqueous solution was increased too within the presence of magnetic field. It can be explained that surface area of Py exposed to aqueous solution was increased as the orientation of Py,which was included in the cavity of HPCD,was modified by MFE,and the hydrophobic interaction between HPCD and Py was reduced. On the other hand,the polarity of Py was increased be- cause MFE heightened the yield efficiency of excited triplet state of Py,and resulted in the hydrophobic interaction between HPCD and Py decreased.

关 键 词：磁场效应 荧光探针 羟丙基-Β-环糊精 芘 

分 类 号：O657.34[理学—分析化学] O657.2[理学—化学]