Spectral properties of some fluorescent dyes in two-dimensional films formed by means of Langmuir–Blodgett technique

Biadasz, Andrzej; Łabuszewska, K.; Chrzumnicka, Ewa; Michałowski, E.; Martyński, Tomasz; Bauman, Danuta

doi:10.1016/j.dyepig.2006.03.025

Cited by 15 publications

(13 citation statements)

References 20 publications

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“…Further, this leads to the conclu− sion that at the transfer of the monolayer from the water sur− face to the quartz plate, a rearrangement of the molecular or− ganization takes place. Such effect was previously observed for other compounds [2,4,15,[18][19][20]. …”

Section: Electronic Absorption Spectra Of Langmuir and Langmuir-blodgsupporting

confidence: 61%

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Molecular organization and aggregation in Langmuir and Langmuir-Blodgett films of azo dye/liquid crystal mixtures

Inglot

Martyński

Bauman

2009

Opto-Electronics Review

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A study of azo dye/liquid crystal mixtures in monolayers formed at air-water (Langmuir films) and air-solid substrate (Langmuir-Blodgett films) interfaces was performed. Three azo dyes with various molecular structure and two liquid crystal materials: 4-octyl-4′-cyanobiphenyl (8CB) and trans-4-octyl(4′-cyanophenyl)-cyclohexane (8PCH) were used. The morphology of Langmuir films was monitored by means of a Brewster angle microscope (BAM). Moreover, a surface pressure and electronic absorption spectra of the monolayer spread on the water surface of dye/liquid crystal mixtures as a function of a mean molecular area were simultaneously recorded. In addition, the absorption for Langmuir-Blodgett films deposited on quartz plates was measured. Information about intermolecular interactions in the mixtures of the nonamphiphilic dye and the liquid crystal with polar terminal group was obtained. Conclusions about the formation of self-aggregates between dye molecules have been drawn. The influence of the dye molecular structure and its concentration on aggregates’ geometry was found.

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Section: Electronic Absorption Spectra Of Langmuir and Langmuir-blodgsupporting

confidence: 61%

“…For the absorption measurements of a spread mono− layer in situ, the spectrophotometer was equipped with opti− cal fibers and a photodiode array detector supplied by Varian. Further details of this setup are given elsewhere [15].…”

Section: Methodsmentioning

confidence: 99%

Molecular organization and aggregation in Langmuir and Langmuir-Blodgett films of azo dye/liquid crystal mixtures

Inglot

Martyński

Bauman

2009

Opto-Electronics Review

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“…This indicates that at the transfer of the monolayer from the water surface to the quartz plate, a rearrangement of the molecular organization takes place. Such effect was previously observed for other compounds [8,10,11,[29][30][31][32]. The rearrangement of the molecules alignment during the transfer was found also for dye 3, but quite different than in the case of other dyes.…”

Section: −7supporting

confidence: 57%

“…The details of the equipment are described in Ref. [11]. The monolayer was compressed to a predetermined surface pressure and maintained there for 5 min before starting spectral measurements.…”

Section: Methodsmentioning

confidence: 99%

Molecular Interactions in Monolayers οf Azo Dye/Liquid Crystal Mixtures at Interfaces

2009

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A study of azo dye/liquid crystal mixtures in monolayers formed at an air-water interface (the Langmuir films) and at a solid surface (the Langmuir-Blodgett films) has been performed. Five azo dyes with various molecular structure and the liquid crystal 4-octyl-4 -cyanobiphenyl (8CB) have been used. The dyes have been added to the liquid crystal at various molar fractions. Surface pressure and surface potential versus mean molecular area isotherms for the Langmuir films have been recorded and information about intermolecular interactions at the air-water interface has been obtained. On the basis of electronic absorption measurements for the Langmuir and Langmuir-Blodgett films the conclusions about the ability of dyes molecules to form self-aggregates at the interfaces have been drawn. The influence of the dye molecular structure and its concentration on aggregates' geometry has been found.

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“…Additionally, absorption spectra of spread monolayers on the water surface were recorded in situ using fiber optic accessory supplied by Varian and connected with spectrophotometer. The details of the equipment are described in [13].…”

Section: Methodsmentioning

confidence: 99%

Intermolecular Interactions in Organic Dye Monolayers Formed by Langmuir-Blodgett Technique

Bauman

2010

Acta Phys. Pol. A

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Langmuir and Langmuir-Blodgett films of some organic dyes (perylene-like dyes, derivatives of 4-aminonaphthalimide, derivatives of naphthoylenebenzimidazole, azo dyes) and their mixtures with thermotropic liquid crystal or arachidic acid have been investigated. Surface pressure as a function of the mean molecular area for the Langmuir films were measured and information about organization of molecules at the air-water interface has been obtained. Absorption spectra in situ for the Langmuir films and both absorption and fluorescence spectra for Langmuir-Blodgett films were recorded. The results obtained from spectroscopic studies have led to conclusions about formation of self-aggregates of dye molecules, both in ground and excited states, at the phases interfaces.

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Spectral properties of some fluorescent dyes in two-dimensional films formed by means of Langmuir–Blodgett technique

Cited by 15 publications

References 20 publications

Molecular organization and aggregation in Langmuir and Langmuir-Blodgett films of azo dye/liquid crystal mixtures

Molecular organization and aggregation in Langmuir and Langmuir-Blodgett films of azo dye/liquid crystal mixtures

Molecular Interactions in Monolayers οf Azo Dye/Liquid Crystal Mixtures at Interfaces

Intermolecular Interactions in Organic Dye Monolayers Formed by Langmuir-Blodgett Technique

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