Abstract
An aqueous pseudoisocyanine dye solution in a soda lime glass optical cell exhibited the new absorption band of a J aggregate at around 577 nm (JL aggregate) at room temperature. The JL band was slightly red-shifted and broader (hwhm: ∼130 cm-1) compared to the previously reported J band (JS band; peak, ∼572 nm; hwhm, ∼70 cm-1). Since formation of the JL aggregate was not observed in a quartz glass cell, it was concluded that JL aggregate formation was induced by interactions between the dye and the soda lime glass surface. Total-internal-reflection fluorescence spectroscopy proved that the JL aggregate was distributed only in the vicinity of the glass surface, whereas the JS aggregate was produced in the bulk water phase.
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