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Issue 11, 2007
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Photophysical properties of Newkome-type dendrimers in aqueous medium

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Abstract

Newkome-type first, second and third generation dendrimers, having t-butyl (GB), ethyl (GE) and carboxylic (GA) end groups, were synthesized. A pyrene group, which can act as fluorescent sensor, was attached to the core of the dendrimers and their photophysical properties in aqueous solution were studied. These dendrimers were found to aggregate in aqueous solution, which manifested as an excimer peak in the pyrene emission spectra for the first and second generation dendrimers with ethyl and t-butyl end groups. The excimer peak however was not seen in case of the third generation dendrimer. Dendrimers with carboxylic end groups, did not show the excimer peak in water, which implies the hydrophobic nature of the aggregation. It is observed that the intensity of the excimer peak decreases with the increase in the size of the dendrimer. Lifetime studies carried out on the first and second generation dendrimers showed the formation of excimer species as a risetime in the decay curve. The aggregation of the third generation dendrimer was proposed from the quenching studies using silver ions and CCl4 as quenchers.

Graphical abstract: Photophysical properties of Newkome-type dendrimers in aqueous medium

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Article information


Submitted
27 Feb 2007
Accepted
17 Aug 2007
First published
28 Aug 2007

Photochem. Photobiol. Sci., 2007,6, 1164-1169
Article type
Paper

Photophysical properties of Newkome-type dendrimers in aqueous medium

S. K. Mohanty, U. Subuddhi, S. Baskaran and A. K. Mishra, Photochem. Photobiol. Sci., 2007, 6, 1164
DOI: 10.1039/B702968C

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