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Intrinsic luminescence properties of ionic liquid crystals based on PAMAM and PPI dendrimers

Paper ID Volume ID Publish Year Pages File Format Full-Text
27850 44046 2009 6 PDF Available
Title
Intrinsic luminescence properties of ionic liquid crystals based on PAMAM and PPI dendrimers
Abstract

The photophysical properties of ionic liquid crystals based on poly(amidoamine) {PAMAM} and poly (propyleneimine) (PPI) dendrimers were examined both in solutions and in thin solid films. The dendrimers were peripherally modified by decanoic, 4-octyloxybenzoic, and 3,4,5-trioctyloxybenzoic acids to generate dendrimer based ionic liquid crystals of smectic and columnar phases. The liquid crystalline properties of these compounds were examined by polarizing optical microscopy (POM) and differential scanning calorimetry (DSC). The dendrimer based ionic liquid crystals exhibited blue emission upon excitation at 370 nm. The emission intensity was found to be enhanced by an order of magnitude in solution when ionic liquid crystals are made from higher generation dendrimers. The steady state and time resolved fluorescence experiments suggest that optical properties of the liquid crystals are originated from the intrinsic emission properties of amine terminated PAMAM and PPI dendrimers. The findings presented here show for the first time that PAMAM and PPI based mesogenic structures can exhibit intrinsic emission in the visible region without incorporating conventional fluorophores.

Keywords
PAMAM or PPI dendrimer; Luminescent liquid crystal; Intrinsic emission
First Page Preview
Intrinsic luminescence properties of ionic liquid crystals based on PAMAM and PPI dendrimers
Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 203, Issue 1, 5 March 2009, Pages 50–55
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering