Langmuir-Blodgett films of merocyanine J aggregates: Preparation and structural change on irradiation by laser light

Kawaguchi, Takeyuki; Iwata, Kaoru

doi:10.1016/0040-6090(88)90703-1

Cited by 27 publications

(16 citation statements)

References 17 publications

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“…MC-LB films were transferred from the surface of an aqueous solution containing CdCl 2 onto a glass substrate. The spectra had a characteristic peak around 608 nm assigned to MC J-aggregates [16,17] due to cross-linking with Cd 2+ ions [18]. The absorbance of the MC-LB films mixed with AA and OD, M121, around 608 nm assigned to MC J-aggregates exhibited a maximum value of 0.60 in the three types of film, M120, M121 and M122.…”

Section: Resultsmentioning

confidence: 98%

Orientation of J-aggregate molecules in Langmuir film and Langmuir–Blodgett films of merocyanine dyes mixed with arachidic acid and n-octadecane and irradiation effect of visible light

et al. 2008

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Section: Resultsmentioning

confidence: 98%

Orientation of J-aggregate molecules in Langmuir film and Langmuir–Blodgett films of merocyanine dyes mixed with arachidic acid and n-octadecane and irradiation effect of visible light

et al. 2008

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“…In fact, the formation and the polymorphic behavior of the J aggregates of DS and DSe can be controlled by changing the temperature, surface pressure, or chemical composition of the subphase, and by mixing inert surfactant such as FA. [22][23][24][25][26][27][28]50,51,58 Sugi et al 14 reported that LB films of a DS-FA mixture prepared with a Cd 2ϩ -containing subphase exhibit clear polymorphic behavior upon secondary treatments with basic vapor, while those of a 6MeDS-FA mixture do not. These facts reflect the instability of the molecular arrangements in the J aggregates of DS and DSe.…”

Section: Models For Molecular Arrangementsmentioning

confidence: 99%

Spectroscopic study of J aggregates of amphiphilic merocyanine dyes formed in their pure Langmuir films

Ikegami

2004

The Journal of Chemical Physics

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It is known that an amphiphilic merocyanine dye, 3-carboxymethyl-5-[2-(3-octadecyl-2(3H)- benzothiazolylidene)ethylidene]-2-thioxo-4-thiazolidinone (DS) and its derivatives DSe and 6MeDS form J aggregates under the presence of metallic cations, although the dyes' static dipole moments must be favorable for H aggregates. A metal-free J aggregate of 6MeDS has been generated in its pure Langmuir films and transferred onto CaF2 substrates to investigate the molecular environment around the carboxylic group born by the dye. Combining visible and infrared spectroscopy, geometrical consideration based on ab initio calculations, and simulation of the excitation energy, a structural model of this J aggregate has been proposed. With this model, formation of intermolecular carboxyl-keto hydrogen bonds, which can compensate the electrostatic disadvantage of the J aggregate under the presence of water, has been suggested. As for another derivative of DS, DO, similar discussion has been made for its Mg2+ -containing J aggregate, which is found in this work. In addition, the proposed structural model can tell the cause of the difference in the tendency to J aggregate among 6MeDS, DSe, DS, and DO.

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“…M. kushida et al [26] reported that J -aggregates of MC molecules decayed to monomer and H -dimer upon irradiation of monochromatic light of suitable wavelength. T. Kawaguchi et al [27] observed that J -aggregation of MC dyes in LB films containing Co +2 ion dissociates upon irradiation of laser light, whereas, the same containing Ba +2 ion do not dissociate upon irradiation of laser light.…”

Section: Irradiation Effect Of Monochromatic Light On J-aggregatesmentioning

confidence: 99%

“…3,3′ -disulfopropyl-5, -dichlorothiacyanine sodium salt (THIAMS) adsorbed onto dioctadecylammonium bromide (DODAB) monolayer were also investigated [25].It was observed that J -aggregates of merocyanine dyes in LB films decayed due to irradiation of monochromatic light [26][27]. However, it is not well known what parameters are essential to control such aggregates in films fabricated by LB technique.…”

Section: Introductionmentioning

confidence: 99%

J-aggregates of thiacyanine dye organized in LB films: Effect of irradiation of light

Hussain

Dey

Chakraborty

et al. 2011

Journal of Luminescence

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Abstract:In the present communication we report the preparation and characterizations of Langmuir and LangmuirBlodgett films of a thiacyanine dye -dioctadecyl thiacyanine perchlorate (NK) mixed with Octadecyl trimethyl ammonium bromide (OTAB). The relationship between the molar ratio of OTAB and NK and the orientation of molecules at the air-water interface was investigated using surface pressure -area per molecule (π-A) isotherm. UV-Vis absorption and fluorescence spectroscopic investigations reveal that prominent J-aggregation of NK molecule was observed in the LB films lifted at higher surface pressure. This J-aggregation can be controlled by diluting the NK molecules with OTAB. It was observed that the J-aggregates of NK decayed to monomer and Haggregates when the NK-LB film was exposed to a monochromatic light of wavelength 460 nm (

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Langmuir-Blodgett films of merocyanine J aggregates: Preparation and structural change on irradiation by laser light

Cited by 27 publications

References 17 publications

Orientation of J-aggregate molecules in Langmuir film and Langmuir–Blodgett films of merocyanine dyes mixed with arachidic acid and n-octadecane and irradiation effect of visible light

Orientation of J-aggregate molecules in Langmuir film and Langmuir–Blodgett films of merocyanine dyes mixed with arachidic acid and n-octadecane and irradiation effect of visible light

Spectroscopic study of J aggregates of amphiphilic merocyanine dyes formed in their pure Langmuir films

J-aggregates of thiacyanine dye organized in LB films: Effect of irradiation of light

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