Journal
JOURNAL OF APPLIED SPECTROSCOPY
Volume 85, Issue 6, Pages 997-1005Publisher
SPRINGER
DOI: 10.1007/s10812-019-00753-0
Keywords
polymethine dyes; molecular aggregates; H*-aggregates; spectral and luminescent properties; self-assembled nanostructures; morphology; atomic force microscopy
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Spectral and luminescent properties of an indotricarbocyanine dye are studied in solutions and after deposition on quartz or silicon substrates. It is found that the dye molecules self-assemble in aqueous EtOH solutions to form H*-aggregates. The absorption band of the H*-aggregates shows a hypsochromic shift of 192 nm (5291 cm(-1)) relative to the absorption maximum of dye monomers (706 nm) and has a full width at half maximum of 21 nm (797 cm(-1)). The morphology of thee-aggregates of the indotricarbocyanine dye is studied for the first time. It is found that the aggregates are rod-like species similar to 10 nm high, 100 nm wide, and several micrometers long. H-aggregates with a fluorescence maximum at 560 nm and Stokes shift of 325 cm(-1) in addition to non-fluorescent It-aggregates form in aqueous EtOH solutions and are nanoparticles with a height of 1-3 nm and lateral dimensions of similar to 100 nm.
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