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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Fluorescence Anisotropy Decay and Solvation Dynamics in a Nanocavity:Coumarin 153 in Methyl beta-Cyclodextrins
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Fluorescence Anisotropy Decay and Solvation Dynamics in a Nanocavity:Coumarin 153 in Methyl beta-Cyclodextrins

机译:纳米腔中的荧光各向异性衰减和溶剂化动力学:Coumarin 153在甲基β-环糊精中

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摘要

Fluorescence anisotropy decay and solvation dynamics of coumarin 153(C153)are studied in dimethyl beta-cyclodextrin(DIMEB)and trimethyl beta-cyclodextrin(TRIMEB)nanocavity in water.C153 binds to DIMEB and TRIMEB to form both 1:1 and 1:2(C153:cyclodextrin)complexes.The anisotropy decays of C153 in DIMEB and TRIMEB are found to be biexponential.The fast component of anisotropy decay(~1000 ps)is attributed to the 1:1 complex and the slower one(~2500 ps)to the 1:2 complex.From the components of the anisotropy decay,the length of the 1:1 and 1:2 complexes are estimated.Solvation dynamics of C153 in DIMEB exhibits a very fast(2.4 ps)component(41%)and two slower components of 50 ps(29%)and 1450 ps(30%).Solvation dynamics in TRIMEB is described by three slow components of 10.3 ps(24%),240 ps(45%),and 2450 ps(31%).Possible origins of the ultraslow components are discussed.
机译:研究了香豆素153(C153)在二甲基β-环糊精(DIMEB)和三甲基β-环糊精(TRIMEB)纳米水中的各向异性,并进行了溶剂化动力学研究。C153与DIMEB和TRIMEB结合形成1:1和1:2 (C153:环糊精)复合物。发现DIMEB和TRIMEB中C153的各向异性衰减是双指数的。各向异性衰减的快速成分(〜1000 ps)归因于1:1的复合物,而慢速成分归因于较慢的成分(〜2500 ps)。从各向异性衰变的成分,估计了1:1和1:2络合物的长度。C153在DIMEB中的溶解动力学表现出非常快的(2.4 ps)成分(41%)和两个慢速分量分别为50 ps(29%)和1450 ps(30%)。TRIMEB中的溶剂化动力学由10.3 ps(24%),240 ps(45%)和2450 ps(31%)的三个慢速分量描述。讨论了超慢组件的可能起源。

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