Optical Absorption Spectroscopy of Strongly Disordered J-Aggregates: Control of Off-Diagonal Disorder
作者:
YuriV. Malyukin,
GennadyS. Katrich,
Klaus Kemnitz,
期刊:
Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals
(Taylor Available online 2000)
卷期:
Volume 348,
issue 1
页码: 15-26
ISSN:1058-725X
年代: 2000
DOI:10.1080/10587250008024792
出版商: Taylor & Francis Group
关键词: exciton dynamics;diagonal and off-diagonal disorder;J-aggregate;absorption spectroscopy
数据来源: Taylor
摘要:
It was shown that the low-frequency edge of the exciton absorption band of J-aggregates of l-methyl-l′-octadecyl-2,2′-cyanine iodide (analogue of PIC) experiences a change from Gaussian to Lorentzian in frozen, binary DMF-H2O solution, upon decrease of water concentration. In a Langmuir-Blodgett film, the shape of the low-frequency edge of exciton absorption band was neither Gaussian nor Lorentzian, in contrast. A model of diagonal and off-diagonal disorder in the molecular chains is proposed to explain the observed band shapes, based on selective solvation of amphiphilic molecules by water and DMF solvent molecules.
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