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Issue 1, 2012
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Fluorescence detection of single guest molecules in ultrasmall droplets of nonpolar solvent

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Abstract

We have investigated emissive behaviours of individual perylenebisimide derivatives, N,N′-dipropyl-1,6,7,12-tetrakis(4-tert-butylphenoxy)-3,4,9,10-perylenetetra-carboxydiimide (BP-PDI), in single ultrasmall droplets of n-octane at room temperature by using confocal and wide-field microscopic techniques. Single BP-PDIs in the small droplets show no distinguishable blinking in the time courses of fluorescence intensity. This is attributed to small probabilities of the formation of the long-lived ionized state leading to the off-state of the fluorescence. Temporal change in the degree of polarization of fluorescence and wide-field fluorescence images indicated short-time adsorption of the fluorescent molecules at the interfaces between n-octane and watery environments. Fluorescence correlation spectroscopy revealed that the adsorption/desorption processes took place at least in two different time scales, probably due to the difference in the adsorption geometry and/or in the interaction, such as van der Waals interaction and hydrogen bonding, between the dye and the interface.

Graphical abstract: Fluorescence detection of single guest molecules in ultrasmall droplets of nonpolar solvent

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Article information


Submitted
05 Jul 2011
Accepted
14 Oct 2011
First published
15 Nov 2011

Phys. Chem. Chem. Phys., 2012,14, 345-352
Article type
Paper

Fluorescence detection of single guest molecules in ultrasmall droplets of nonpolar solvent

M. Yasuda, A. Iida, S. Ito and H. Miyasaka, Phys. Chem. Chem. Phys., 2012, 14, 345
DOI: 10.1039/C1CP22207D

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