Photoinduced Increase in Vesicle Size and Role of Photoresponsive Malachite Green Leuconitrile Derivative in Vesicle Fusion

The influence of photoirradiation on vesicles containing a Malachite Green leuconitrile derivative carrying a long alkyl chain, affording photogenerated amphiphilicity, was investigated. The photoresponsive Malachite Green leuconitrile derivative was embedded in the vesicle bilayer of two single-tai...

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Bibliographic Details
Published in:Langmuir 2007-07, Vol.23 (15), p.7936-7941
Main Authors: Uda, Ryoko M, Yamashita, Daisuke, Sakurai, Yoshiaki, Kimura, Keiichi
Format: Article
Language:English
Subjects:
Alkanesulfonic Acids - chemistry
Cetrimonium Compounds - chemistry
Chemistry
Colloidal state and disperse state
Exact sciences and technology
General and physical chemistry
Membranes
Membranes, Artificial
Micelles
Nitriles - chemistry
Particle Size
Photochemistry
Rosaniline Dyes - chemistry
Surface physical chemistry
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Summary:The influence of photoirradiation on vesicles containing a Malachite Green leuconitrile derivative carrying a long alkyl chain, affording photogenerated amphiphilicity, was investigated. The photoresponsive Malachite Green leuconitrile derivative was embedded in the vesicle bilayer of two single-tailed amphiphiles with oppositely charged head groups consisting of cetyltrimethylammonium chloride (CTAC) and sodium octyl sulfate (SOS). Transmission electron microscopy, which was used for observing photoinduced structural change in the vesicles, demonstrated that photoirradiation of the vesicles containing the Malachite Green leuconitrile derivative increased the average size of the vesicle diameter from 116 to 243 nm in the [CTAC]/[SOS] = 0.48 system. The mechanism for vesicle enlargement was studied with fluorescent probe molecules. The photoinduced change in the vesicle size can be explained by the destabilization of the vesicle bilayer, which is perturbed by photogenerated amphiphilicity. In addition, it was shown that the fusion process arising from the destabilized bilayer contributed to the increase in vesicle size.
ISSN:0743-7463
1520-5827
DOI:10.1021/la700831z