Cavity Size Effect on the Excited State Dynamics of Methyl 4-(Dimethylamino)benzoate-Cyclodextrin Complexes

Yoshihisa Matsushita; Tadashi Suzuki; Teijiro Ichimura; Takumi Hikida

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Cavity Size Effect on the Excited State Dynamics of Methyl 4-(Dimethylamino)benzoate-Cyclodextrin Complexes

机译：腔尺寸对4-（二甲基氨基）苯甲酸甲酯-环糊精复合物激发态动力学的影响

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The effect of cyclodextrin(CD)complexation on the fluorescence properties of methyl 4-(dimethylamino)-benzoate(MDMAB)was studied.The complex with alpha-,beta-,and gamma-CDs exhibited twisted intramolecular charge transfer(TICT)fluorescence whereas only the emission from the locally excited state was observed in aqueous solution without CD.In the case of the a-CD complex,dual TICT emission was observed,a low-energy emission was centered at 520 nm,and a higher-energy emission was centered at 450 nm.The dependence of TICT emission intensity on pH and a-CD concentration suggested that the lower and higher energy emission can be attributed to the TICT states of MDMAB in the 1:1 and 1:2 MDMAB-alpha-CD complexes.On the other hand,only the formation of 1:1 complex was observed in the presence of beta- and gamma-CDs.The cavity size effect on the fluorescence properties of MDMAB was further discussed on the basis of time-resolved laser spectroscopy.

机译：研究了环糊精（CD）配合物对4-（二甲基氨基）-苯甲酸甲酯（MDMAB）的荧光性质的影响。具有α-，β-和γ-CDs的配合物表现出扭曲的分子内电荷转移（TICT）荧光，而在没有CD的水溶液中，仅观察到局部激发态的发射。在a-CD络合物的情况下，观察到双TICT发射，低能发射集中在520 nm，而高能发射则集中在520 nm。 TICT发射强度对pH和a-CD浓度的依赖性表明，较低和较高的能量发射可归因于1：1和1：2MDMAB-α-CD复合物中MDMAB的TICT状态另一方面，在β-和γ-CDs的存在下仅观察到了1：1复合物的形成。在时间分辨激光光谱的基础上，进一步讨论了腔尺寸对MDMAB荧光性质的影响。

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《The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory》 |2004年第37期|共7页
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Yoshihisa Matsushita; Tadashi Suzuki; Teijiro Ichimura; Takumi Hikida;
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Cavity Size Effect on the Excited State Dynamics of Methyl 4-(Dimethylamino)benzoate-Cyclodextrin Complexes

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