Formation and Characterization of H-Like Band in Merocyanine Dye LB Films

Hirano, Yoshiaki; Sano, Hiroaki; Shjmada, J.; Chiba, Hiromi; Kawata, Jun-ichi; Miura, Yasühiro; Sugi, Michio; Ishii, Toshio

doi:10.1080/10587259708032272

Cited by 17 publications

(12 citation statements)

References 11 publications

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“…The minimum of E st for an antiparallel arrangement is always located at sϭ0 and an H aggregate should be formed if E st solely determines the molecular arrangement. In fact, Hirano et al [33][34][35] reported that DS forms H aggregates in L films under certain preparation conditions. Therefore, other interaction͑s͒ must compensate this electrostatic disadvantage of the J aggregates.…”

Section: ͑1͒mentioning

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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Section: ͑1͒mentioning

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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“…The 505 nm band is found to be due to an H aggregate referring to the energy shift, the sharpness, and the in-plane anisotropy of the band. [7][8][9][10] For revealing the role of the hydrocarbon chains in the MS aggregate formation, it is important to characterize their conformation and its change caused by the introduction of the third component.…”

Section: Infrared Spectroscopic Study On the Langmuir-blodgett Films mentioning

confidence: 99%

“…The aqueous subphase containing Cd 2ϩ and the deposition conditions were the same as given in the previous papers. [7][8][9][10] The five-layered LB films of cadmium arachidate (CdC 20 ) deposited on both sides of the CaF 2 plate were used as the precoated substrate. Fifty-layered LB films of CdC 20 deposited on both sides of the precoated substrate were used as the reference for estimating the tilt angle of hydrocarbon chains on the precoated substrate.…”

Section: A Sample Preparationmentioning

confidence: 99%

“…I, it is known that the LB film of the MS-C 20 binary system shows the redshifted band at 590 nm associated with the J aggregate, 4,5 and that a blueshifted band at 505 nm is observed for the mixed LB films of the MS-C 20 -AL 18 ternary system with the molar mixing ratio ͓MS͔:͓C 20 ͔:͓AL 18 ͔ϭ1:2:x (xϭ0.5, 1.0, and 1.5͒. [7][8][9][10] We have concluded that the 505 nm band is due to the H aggregates. In the present study, the aggregation states of the MS dye have been correlated with the mobility and the orientation of the hydrocarbon chain of MS: ͑i͒ the J aggregate is accompanied by the thermal motion of the hydrocarbon chain of MS, where the tilt angle of the hydrocarbon chain of MS is estimated as ␥ av ϭ25°and ͑ii͒ the H aggregate is accompanied by the highly packed state of the hydrocarbon chains of MS and AL 18 -d, with the tilt angle of the hydrocarbon chain of MS being estimated as ␥ av ϭ17°.…”

Section: B Aggregation States Of the Ms Dye Correlated With The Mobimentioning

confidence: 99%

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Infrared spectroscopic study on the Langmuir–Blodgett films of merocyanine dye–arachidic acid–n-octadecane ternary system

Morita

Miura

Sugi

et al. 2003

Journal of Applied Physics

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Articles you may be interested inOligo(vinylidene fluoride) Langmuir-Blodgett films studied by spectroscopic ellipsometry and the density functional theorySize and molecular configuration of dye aggregates in mixed Langmuir-Blodgett films based on merocyanine dyeWe have studied the mobility and the orientation of the hydrocarbon chain in the Langmuir-Blodgett films of merocyanine dye ͑MS͒-arachidic acid (C 20 ) -n-octadecane (AL 18 ) with the molar mixing ratio ͓MS͔:͓C 20 ͔:͓AL 18 ͔ϭ1:2:x (xϭ0,1,2,3,4,5) by means of infrared spectroscopy. Deuterated C 20 (C 20 -d) and deuterated AL 18 (AL 18 -d) have been used to separate the infrared bands due to the hydrocarbon chain of MS. The bandwidths of CH 2 antisymmetric and CH 2 symmetric stretching modes decrease in the range from xϭ0 up to 2, indicating that the motion of the hydrocarbon chain of MS is hindered by mixing the AL 18 -d molecules as the third component. From xϭ0 to 2, the orientation of the long axis of the MS hydrocarbon chain is found to change. The change in orientation is associated with the decrease in the mobility of the MS hydrocarbon chain. It is indicated that the J aggregate is accompanied by the thermal motion of the hydrocarbon chain of MS, and that the H aggregate is accompanied by the highly packed state of the hydrocarbon chains of MS and AL 18 -d, suggesting that the aggregate formation is controlled by the state of hydrocarbon chain packing.

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“…These materials exhibit much enhanced potentials in LB deposition with respect to pristine C60. [26][27][28][29] However, an elegant and novel approach implies the utilisation of amino acid derivatives of C60 in association with a subphase containing an oligopeptide. 3o .…”

mentioning

confidence: 99%

Recent Developments in Langmuir-Blodgett Films Containing Fullerene Derivatives

Valli

Perosa

Tundo

2003

Advanced Macromolecular and Supramolecular Materials and Processes

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As a consequence of the detection of the fullerene series by Kroto et al.I and their consequential production in large amounts and by an easy procedure at the beginning of the nineties thanks to Kratschmer contribution,2 great interest has been concentrated on the investigations of the physical and chemical characteristics of these innovative materials. A considerable impulse to these examinations was given by the discovery of the superconductivity at high temperature which occurs when fullerenes are doped with alkali metals. 3 Fullerenes constitute a newborn and uncommon class of allotropes of carbon (the so-called third allotropic form of carbon). They and their functionalised derivatives are stimulating from both the basic and application perspectives owing to their appealing characteristics, such as superconductivity, ferromagnetism, nonlinear optical properties, charge-transfer behavior. 4 Practicable functions range from carbon composites and molecular sieves to catalysts, lubricants, optical limiters, superconducting and nanoscale devices. Anyhow, there are substantial requirements to promote processing procedures starting from fullerene and producing fullerene-derived materials that are the active constituents in thin films. In fact, in many cases, an essential requirement for the systematic investigation of the above-mentioned properties is the incorporation of fullerenes in organised 2D-arrays and 3D-networks .

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Formation and Characterization of H-Like Band in Merocyanine Dye LB Films

Cited by 17 publications

References 11 publications

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

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

Infrared spectroscopic study on the Langmuir–Blodgett films of merocyanine dye–arachidic acid–n-octadecane ternary system

Recent Developments in Langmuir-Blodgett Films Containing Fullerene Derivatives

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