Morphological characterization of H aggregates in Langmuir-Blodgett films of pyridinium-dicyanomethanide dyes

被引：22

作者：

Ricceri, R

Neto, C

Abbotto, A

Facchetti, A

Pagani, GA

机构：

[1] Univ Florence, Dept Chem, I-50121 Florence, Italy

[2] Univ Florence, CSGI, I-50121 Florence, Italy

来源：

LANGMUIR | 1999年 / 15卷 / 06期

关键词：

D O I：

10.1021/la981364w

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We investigated the aggregation of the pyridinium-dicyanomethanide dye 4 -[5-(dicyanomethanido)thien-2-yl]-N-(n-hexadecyl)pyridinium (C16H33-PDCNT), in transferred films obtained with the Langmuir-Blodgett (LB) technique; this behavior is an example for the formation of H* aggregates, which show strongly blue-shifted and sharp electronic absorption bands. Surface pressure-area isotherms are reported at T = 291 K. LB films were investigated by UV-vis spectroscopy and optical and atomic force microscopy in order to obtain information about the molecular structure of the aggregates. The molecule strongly absorbs in the visible region because of a charge-transfer band; the sharp peak at 422 nm is attributed to the formation of H* aggregates.

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页码：2149 / 2151

页数：3

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