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ID 37982
本文ファイル
著者
Morishima, Fumiya
Kusaka, Ryoji
NDC
化学
抄録(英)
We present the structure of 18C6-catechol host-guest complex and the effect of the complexation on the S1 dynamics of catechol studied under a supersonically cooled gas phase condition and in cyclohexane solution. In the gas phase bare catechol, two adjacent OH groups have an intramolecular hydrogen-bonded structure. On the other hand, in the 18C6-catechol (1:1) complex both of the catechol OH groups are hydrogen-bonded to the oxygen atoms of 18C6. This complex formation greatly changes the character of the S1 state of catechol. That is, the S1 lifetime of bare catechol is reported to be 7 ps, while the 18C6-catechol complex was obtained to be 10.3 ns. This anomalous S1 lifetime elongation of catechol upon the complexation is attributed to a large energy gap between the S1 (ππ*) and S2 states by the switching from the intramolecular hydrogen-bond to the intermolecular hydrogen-bond in the host-guest complex. The formation of the18C6-catechol complex formation was also confirmed in cyclohexane solution, and an anomalous increase of fluorescence quantum yield of catechol was also observed. From the concentration dependence of the fluorescence intensity, it was confirmed that 18C6 and catechol also form (1:1) host-guest complex in bulk system. An equilibrium constant for the18C6 + catechol ⇄ 18C6・・・catechol reaction was obtained. It is suggested that that 18C6 can act as a sensor of detecting catechol.
内容記述
This is a preprint of an article published by American Chemical Society in Journal of Physical Chemistry B, 2015, available online: http://pubs.acs.org/doi/abs/10.1021/jp508619f.
掲載誌名
Journal of Physical Chemistry B
119巻
6号
開始ページ
2557
終了ページ
2565
出版年月日
2015-02-12
出版者
American Chemical Society
ISSN
1520-6106
出版者DOI
PubMedID
言語
英語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
author
権利情報
Copyright (c) 2014 American Chemical Society
関連情報URL(IsVersionOf)
http://dx.doi.org/10.1021/jp508619f
部局名
理学研究科