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Cryo-transmission electron microscopy reveals mesoscopic H- and J-aggregates of near infrared cyanine dyes

Paper ID Volume ID Publish Year Pages File Format Full-Text
27514 44028 2010 6 PDF Available
Title
Cryo-transmission electron microscopy reveals mesoscopic H- and J-aggregates of near infrared cyanine dyes
Abstract

Cryogenic transmission electron microscopy (cryo-TEM) studies were performed to probe the morphological structure of aggregates formed by the two near-infrared dyes IR-140 and Indocyanine Green (ICG) in water. Both dyes formed sheet-like monolayered J-aggregates of mesoscopic size. This structure is consistent with a stacking geometry known for other cyanine dye J-aggregates. H-aggregates, which dominate in freshly prepared aqueous ICG solutions, proved to be linear aggregates of mesoscopic size that are characterized by a broad size distribution. Besides small oligomer particles up to tens of nanometers long thread-like aggregates were detected.

Keywords
Aggregate morphology; Monomolecular layers; Sheet-like aggregates; Thread-like particles; Indocyanine Green; Laser dyes
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Cryo-transmission electron microscopy reveals mesoscopic H- and J-aggregates of near infrared cyanine dyes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 214, Issue 1, 5 July 2010, Pages 16–21
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
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Any Questions? feel free to contact us