期刊
CURRENT APPLIED PHYSICS
卷 6, 期 4, 页码 813-819出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.cap.2005.04.046
关键词
J-aggregates; Langmuir-Blodgett films; self-assemble; molecular nanostructure; merocyanine dyes; infrared spectroscopy
The electronic absorption spectra of pure Langmuir (L) films of 6MeDS prepared upon MgCl2, CaCl2, CdCl2, and CuCl2 aqueous solutions have shown that the Mg2+, Ca2+, and Cd2+ cations promote the J-aggregation of the dye, but the Cu2+ cation inhibits it. Instead, the Cu2+ cation promotes the formation of another type of dye aggregate (D-aggregate), which exhibits a split electronic absorption band. These L films have been transferred onto solid substrates by the Langmuir-Blodgett (LB) technique. The vibronic absorption spectra observed for the obtained LB films have shown the similarity between the metal-cation-containing J-aggregate and the metal-free J-aggregate of the dye, the latter of which was characterized in the previous study [K. Ikegami, J. Chem. Phys. 121 (2004) 2337]. These spectra have also indicated that the bimolecular metal chelation plays an important role in the J-aggregation, like the intermolecular hydrogen bonding in the metal-free case. (c) 2005 Elsevier B.V. All rights reserved.
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