Journal
CHEMICAL PHYSICS LETTERS
Volume 396, Issue 4-6, Pages 316-322Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cplett.2004.08.045
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Concentration-dependent string-to-sheet morphological transition of supramolecular thiacyanine J aggregates was demonstrated in aqueous solutions. Fluorescence microscopy and atomic force microscopy revealed that the string-like J aggregate was a bundle of thinner strings, whereas the sheet-like aggregate had a rectangular structure with a two-dimensional monomolecular layer of molecules (nanosheet). The well-defined morphology of the single nanosheet allows us to evaluate its optical anisotropy with polarized-light microscopy. The rectangular nanosheet of J aggregates showed large negative birefringence of about -1.2 +/- 0.2 (at 550 nm), indicating that the dye molecules are likely to orient along the short axis of the sheet. (C) 2004 Elsevier B.V. All rights reserved.
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