NONCENTROSYMMETRIC AND CENTROSYMMETRIC J-AGGREGATION IN PHOTOMEROCYANINE MONOLAYER STUDIED BY 2ND-HARMONIC GENERATION AND ABSORPTION-SPECTROSCOPY

被引：15

作者：

KAJIKAWA, K ^{[1
]}

ANZAI, T ^{[1
]}

TAKEZOE, H ^{[1
]}

FUKUDA, A ^{[1
]}

机构：

[1] TOKYO INST TECHNOL, DEPT ORGAN & POLYMER MAT, MEGURO KU, TOKYO 152, JAPAN

来源：

THIN SOLID FILMS | 1994年 / 243卷 / 1-2期

关键词：

D O I：

10.1016/0040-6090(93)04104-Z

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We found that photomerocyanine isomerized from spiropyran (SP-1822) forms two different kinds of J-aggregation by use of second-harmonic generation and absorption spectroscopy. First, a J aggregate, which has an absorption peak at 608 nm in a monolayer at the air/water interface under high surface pressure: since the molecules in the aggregate align in a certain direction with the same sense, strong second-harmonic light generates in the monolayer. On deposition, the aggregate dissociates and the molecules change into monomers. After a while, the molecules start to form new J aggregates. Promotion of the association by heating and the fact that these are no second-harmonic activities of the aggregates suggest that the molecules cancel each other's polarity in the second J aggregate.

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页码：587 / 591

页数：5

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