The formation and structure of aggregates in hemicyanine monolayers

Robert A. Hall, Peter J. Thistlethwaite, Franz Grieser, Nobuo Kimizuka, Toyoki Kunitake

Research output: Contribution to journalArticle

11 Citations (Scopus)

Abstract

Absorption spectra of a hemicyanine monolayer on a sodium sulfate subphase were recorded as a function of surface pressure. Upon compression, the intensity of the monomer band is reduced and two new bands are observed. The results from principal factor analysis of the spectra and the clear isosbestic points indicate that the two bands are due to exciton splitting from an aggregate structure with two molecules per unit cell. By comparison with spectra obtained previously, the influence of counterions and the dilution of the dye monolayer on the formation and structure of the aggregates is investigated. The addition of sulfate counterions to the subphase raises the threshold surface concentration for the formation of aggregates, and produces an aggregate structure in which one long molecular axis is oriented closer to the surface normal. Dilution of the dye monolayer results in a small change to the aggregate structure. Furthermore, if it is assumed that the dye-diluent monolayer is inhomogeneous, dilution has no significant effect on the surface concentration dependence of the formation of aggregates.

Original languageEnglish
Pages (from-to)167-172
Number of pages6
JournalColloids and Surfaces A: Physicochemical and Engineering Aspects
Volume103
Issue number3
DOIs
Publication statusPublished - Oct 10 1995

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Monolayers
Dilution
dilution
Coloring Agents
Dyes
dyes
factor analysis
Sodium sulfate
diluents
Factor analysis
sodium sulfates
Excitons
Sulfates
tetramethylene hemicyanine
Absorption spectra
sulfates
monomers
Monomers
excitons
absorption spectra

All Science Journal Classification (ASJC) codes

  • Surfaces and Interfaces
  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

The formation and structure of aggregates in hemicyanine monolayers. / Hall, Robert A.; Thistlethwaite, Peter J.; Grieser, Franz; Kimizuka, Nobuo; Kunitake, Toyoki.

In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 103, No. 3, 10.10.1995, p. 167-172.

Research output: Contribution to journalArticle

Hall, Robert A. ; Thistlethwaite, Peter J. ; Grieser, Franz ; Kimizuka, Nobuo ; Kunitake, Toyoki. / The formation and structure of aggregates in hemicyanine monolayers. In: Colloids and Surfaces A: Physicochemical and Engineering Aspects. 1995 ; Vol. 103, No. 3. pp. 167-172.
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