Abstract: The formation and properties of J-aggregates in thin solid films of pseudoisocyanines with long N-alkyl groups, obtained by centrifuging from solutions in organic solvents, were studied. It is shown for the first time that nonsymmetric cyanine dyes, containing a C2H5 group at one nitrogen atom and a C10H21, C15H31, or C18H37 group at another nitrogen atom, spontaneously form J-aggregates stable at room temperature and pressing a narrow, absorption band with a half-width at half maximum of 200 cm(-1). The thermal stability of J-aggregates in thin films of pseudoisocyanines with alkyl substituents decreases in the following order: C2H5-C2H5 > C2H5-C6H13 > C2H5-C18H37 > C2H5-C10H21 > C2H5-C15H31. By introducing 1-octadecyl-2-methylquinolinium iodide in the film, it was found that the J-aggregates studied consist of a small number (2-4) of dye molecules. (C) 2002 MAIK "Nauka/Interperiodica".

Cite: Shelkovnikov V. , Ivanova Z. , Orlova N. , Gerasimova T. , Plekhanov A.
J-aggregates of pseudoisocyanine with long alkyl substituents in thin films: Synthesis, spectral properties, and thermal stability
Optics and Spectroscopy (English translation of Optika i Spektroskopiya). 2002. V.92. N6. P.884-891. DOI: 10.1134/1.1490026 WOS Scopus

Dates:

Published print:

Jun 1, 2002

Identifiers:

Web of science	WOS:000176976100008
Scopus	2-s2.0-0141731244
OpenAlex	W1994502397

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