Effects of aliphatic tails on monolayer structures of hemicyanine dyes at the air/water interface as studied by in situ SHG measurements and surface pressure-area isotherms

Niidome, Yasuro; Ayukawa, Hiromitsu; Yamada, S.

doi:10.1016/s1010-6030(00)00207-0

Cited by 12 publications

(7 citation statements)

References 33 publications

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“…Langmuir monolayers, Langmuir–Blodgett (LB) films, and self-assembled monolayers based on hemicyanine dyes have been the subject of intense research activities in the past decades − because of unique optical and fluorescence properties of these dyes amplified by features of organized ultrathin films (asymmetrical systems). Of particular interest is the ability of such compounds to form different types of aggregates, which in turn affect substantially their optical, thermal, and mechanical properties when they are organized in monolayers.…”

Section: Introductionmentioning

confidence: 99%

Cation-Controlled Excimer Packing in Langmuir–Blodgett Films of Hemicyanine Amphiphilic Chromoionophores

et al. 2016

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Supramolecular structure of ultrathin films of hemicyanine dye bearing a crown ether group (CrHCR) was tuned by lateral pressure and investigated by means of compression isotherms, UV-vis and fluorescence spectroscopies, and X-ray reflectivity. Two different types of aggregation were revealed, depending on the absence or the presence of metal cations in the water subphase. While CrHCR forms at high surface pressures head-to-tail stacking aggregates on pure water, changing the subphase to a metal-cation-containing one leads to the appearance of well-defined excimers with head-to-head orientation. The structure of monolayers transferred onto solid supports by the Langmuir-Blodgett (LB) technique was examined by use of X-ray reflectivity measurements and molecular modeling. A model of cation-induced excimer formation in hemicyanine Langmuir monolayers is proposed. Finally, fluorescence emission properties of LB films of CrHCR can be managed by appropriate changes in the subphase composition, this last one determining the type of chromophore aggregation.

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Section: Introductionmentioning

confidence: 99%

Cation-Controlled Excimer Packing in Langmuir–Blodgett Films of Hemicyanine Amphiphilic Chromoionophores

et al. 2016

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“…Langmuir monolayers and Langmuir-Blodgett films (LBF) based on hemicyanine dye derivatives are the subject of intensive research in the last decades [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16] due to the unique optic and fluorescent properties of these compounds and structural features of two-dimensional systems based on them. The ability of hemicyanines to form aggregates of various types, which, in their turn, significantly affect optical, thermal, and mechanical properties of organized monolayers, is of special interest.…”

Section: Introductionmentioning

confidence: 99%

Factors Affecting the Structural Organization of Hemicyanine Chromoionophores in Langmuir Monolayers

Shokurov¹,

Silant’yeva²,

Arslanov³

et al. 2016

MHC

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“…A class of styryl pyridinium dyes has the following particularly interesting photophysical property: a high molecular hyperpolarizability that plays a key role in second-harmonic generation − as well as in the sensitivity to the environment, detectable as a solvatochromic effect or as the dependence of the electrical membrane potential . Furthermore, the generation of photocurrents using this type of dye has been studied in detail. , …”

Section: Introductionmentioning

confidence: 99%

Molecular Organization of an Amphiphilic Styryl Pyridinium Dye in Monolayers at the Air/Water Interface in the Presence of Various Anions

et al. 2006

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Amphiphilic 4-(3',4'-dimethoxystyryl)-N-octadecylpyridinium perchlorate and bromide form stable monolayers at the air/water interface. Small differences in the surface pressure-area and surface potential-area isotherms depending on the anion indicate interactions between the chromophore and the anions on the pure water subphase. The monolayer behavior is considerably modified on 10 mM aqueous solutions of KI, KClO4, KCl, and KF as revealed by isotherm measurements, reflection spectroscopy, and Brewster angle microscopy. The phase transition observed in the isotherms is shifted to higher surface pressure because of variation of the salt according to the Hofmeister series. Upon monolayer compression, the chromophores are increasingly tilted, and a shift of the band to longer wavelengths is attributed to the environment becoming less polar. However, in the case of KCl at small areas per molecule, relaxation is observed at constant area with the appearance of a new band shifted to shorter wavelengths. This band is assigned to small associates of about four chromophores (H aggregates). In the case of KI, a new band shifted to longer wavelengths is found. Theoretical calculations did not yield a transition in the observed range, even for large aggregates (J aggregates). Therefore, other interactions may be responsible for the appearance of this band.

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Effects of aliphatic tails on monolayer structures of hemicyanine dyes at the air/water interface as studied by in situ SHG measurements and surface pressure-area isotherms

Cited by 12 publications

References 33 publications

Cation-Controlled Excimer Packing in Langmuir–Blodgett Films of Hemicyanine Amphiphilic Chromoionophores

Cation-Controlled Excimer Packing in Langmuir–Blodgett Films of Hemicyanine Amphiphilic Chromoionophores

Factors Affecting the Structural Organization of Hemicyanine Chromoionophores in Langmuir Monolayers

Molecular Organization of an Amphiphilic Styryl Pyridinium Dye in Monolayers at the Air/Water Interface in the Presence of Various Anions

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