Jump to main content
Jump to site search

Issue 6, 1985

Polarized-light spectroscopic study of indocarbocyanine dyes solubilized in amphiphile aggregates

Abstract

The solubilization and the fluorescence properties of indocarbocyanines in ionic and non-ionic micelles and cubic liquid crystals have been studied. The indocarbocyanines are two dialkyl derivates (C2H5— and C14H29—), commonly denoted as DiIC2(3) and DiIC14(3). The steady-state anisotropy and the quantum yield of fluorescence have been measured, and the radiative lifetime of both dyes determined (2.2 ns). In the aggregates of ionic amphiphiles such as sodium octanoate, octylammonium chloride and dodecyltrimethylammonium chloride the rotational correlation time of both dyes was found to increase with increasing concentration of the detergent. In micelles of the non-ionic pentaethyleneglycol mono-n-dodecylether no such dependence on the concentration is found. A reasonable explanation is that the large indocarbocyanine molecules perturb the relatively small ionic aggregates while the large non-ionic ones are much less affected.

From linear-dichroism studies of the dyes in lamellar liquid crystals it has been concluded that both these chromophores are oriented with their long axis preferentially parallel to the plane of a bilayer.

The reciprocal rate of the non-radiative processes is found to increase linearly with increasing rotational correlation time of the fluorophore. Very similar behaviour has been found for ordinary solutions of alcohols, which suggests that the orientational distribution of the dye molecules in the amphiphile aggregates has a negligible effect on the non-radiative processes of the indocarbocyanines.

Article information


J. Chem. Soc., Faraday Trans. 1, 1985,81, 1389-1400
Article type
Paper

Polarized-light spectroscopic study of indocarbocyanine dyes solubilized in amphiphile aggregates

L. B-Å. Johansson, T. Vallmark and G. Lindblom, J. Chem. Soc., Faraday Trans. 1, 1985, 81, 1389 DOI: 10.1039/F19858101389

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.


Search articles by author

Spotlight

Advertisements