通过二次谐波产生和原子力显微镜研究沉积在朗缪尔-布洛杰特单分子层中的两亲性推拉发色团的组织和取向。

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

作者信息

Leray A, Leroy L, Le Grand Y, Odin C, Renault A, Vié V, Rouède D, Mallegol T, Mongin O, Werts M H V, Blanchard-Desce M

机构信息

GMCM, CNRS UMR 6626, Institut de Physique de Rennes, and SESO, CNRS UMR 6510, Institut de Chimie de Rennes, Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex, France.

出版信息

Langmuir. 2004 Sep 14;20(19):8165-71. doi: 10.1021/la0491706.

DOI:10.1021/la0491706

PMID:15350088

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.

摘要

通过二次谐波产生对与两种磷脂（二棕榈酰磷脂酰胆碱和二油酰磷脂酰胆碱）混合的两种两亲性推拉发色团在朗缪尔-布洛杰特（LB）单分子层中的取向和组织进行了研究。LB单分子层也通过原子力显微镜和紫外-可见光谱进行了表征。研究了发色团的有效分子取向和超极化率作为磷脂浓度的函数。在发色团取向分布模型的框架内讨论了实验结果，该模型给出了取向平均角度和取向无序的界限。发现发色团的平均取向在45-55度范围内，而考虑到最大取向无序，相对于石英测量的它们的超极化率系数估计在(0.3-0.7)×10(-27) esu范围内。