Organization and orientation of amphiphilic push-pull chromophores deposited in Langmuir-Blodgett monolayers studied by second harmonic generation and atomic force microscopy

Langmuir : the ACS Journal of Surfaces and Colloids
A LerayMireille Blanchard-Desce

Abstract

Orientation and organization of two amphiphilic push-pull chromophores mixed with two phospholipids (dipalmitoylphosphatidylcholine and dioleoylphosphatidylcholine) in Langmuir-Blodgett (LB) monolayers are investigated by second harmonic generation. The LB monolayers have also been characterized by atomic force microscopy and UV-vis spectroscopy. The effective molecular orientations and hyperpolarizabilities of the chromophores are studied as a function of the phospholipid concentrations. The experimental results are discussed within the frame of a model of orientational distribution of the chromophores which gives the orientational mean angle and bounds on the orientational disorder. The mean orientation of the chromophores is found to be within 45-55 degrees whereas their hyperpolarizability coefficients, measured with respect to quartz, are estimated to be in the range (0.3-0.7) x 10(-27) esu taking account of the maximal orientational disorder.

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Citations

Jan 13, 2015·Biomedical Optics Express·Sotiris PsilodimitrakopoulosDavid Artigas
Oct 1, 2008·Optics Express·Christophe OdinYann Le Grand
Aug 6, 2009·Optics Express·Sotiris PsilodimitrakopoulosPablo Loza-Alvarez
Mar 12, 2013·Biophysical Journal·Sotiris PsilodimitrakopoulosPablo Loza-Alvarez
Oct 14, 2021·Langmuir : the ACS Journal of Surfaces and Colloids·Ramkrishna SarkarS Ramakrishnan

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