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ID 37982
file
creator
Morishima, Fumiya
Kusaka, Ryoji
NDC
Chemistry
abstract
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.
description
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.
journal title
Journal of Physical Chemistry B
volume
Volume 119
issue
Issue 6
start page
2557
end page
2565
date of issued
2015-02-12
publisher
American Chemical Society
issn
1520-6106
publisher doi
pubmed id
language
eng
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
author
rights
Copyright (c) 2014 American Chemical Society
relation is version of URL
http://dx.doi.org/10.1021/jp508619f
department
Graduate School of Science