Interlayer energy transfer between chromophoric carbazole and oxacyanine in Langmuir-Blodgett films: site selectivity of trapping

Ohta, Nobuhiro; Okazaki, Satoshi; Yoshinari, Shinichi; Yamazaki, Iwao

doi:10.1016/0040-6090(94)06381-8

Cited by 11 publications

(4 citation statements)

References 22 publications

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“…CA and its derivatives are also of great interest to the spectroscopists owing to their unique photo-physical characteristics like an intense and well characterized absorption and fluorescence spectra [5][6]. Owing to their excellent optical and electronic properties, various amphiphilic derivatives of carbazole were synthesized and studied in the Langmuir-Blodgett films [5][6][7][8][9][10][11][12][13]. However the synthesis of these amphiphilic carbazole derivatives and their purification are extremely difficult.…”

Section: Introductionmentioning

confidence: 99%

Role of microenvironment in the mixed Langmuir–Blodgett films

Hussain

Paul

Bhattacharjee

2006

Journal of Colloid and Interface Science

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This paper reports the pi-A isotherms and spectroscopic characteristics of mixed Langmuir and Langmuir-Blodgett (LB) films of nonamphiphilic carbazole (CA) molecules mixed with polymethyl methacrylate (PMMA) and stearic acid (SA). pi-A isotherm studies of mixed monolayer as well as the remarkable change in collapse pressure of the mixed monolayer isotherms definitely show that CA is incorporated into PMMA and SA matrices. However, CA is stacked in the PMMA/SA chains and forms microcrystalline aggregates, as is evidenced from the scanning electron micrograph picture. The nature of these aggregated species in the mixed LB films has been revealed by UV-vis absorption and fluorescence spectroscopic studies. The presence of two different kinds of band systems in the fluorescence spectra of the mixed LB films have been observed. This may be due to the formation of low-dimensional aggregates in the mixed LB films. Intensity distribution of different band systems is highly sensitive to the microenvironment of two different matrices as well as also on the film thickness.

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Section: Introductionmentioning

confidence: 99%

Role of microenvironment in the mixed Langmuir–Blodgett films

Hussain

Paul

Bhattacharjee

2006

Journal of Colloid and Interface Science

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“…According to previous studies, 41,42 11-CU in fatty acid matrix LB film is oriented with its chromophore long and short axes at an average of 35°with respect to the substrate surface. This orientation can differ slightly with the deposition conditions such as surface pressure, subphase, and matrix compound.…”

Section: Discussionmentioning

confidence: 96%

Interlayer Energy Transfer between Carbazole and Two 9-Anthroyloxy Derivatives in Langmuir−Blodgett Films

et al. 1999

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The interlayer excitation energy transfer between 11-(9-carbazole)undecanoic acid (11-CU) and two 9-anthroyloxy derivatives, 9-(9-anthroyloxy)stearic acid (9-AS) and 2-(9-anthroyloxy)stearic acid (2-AS), in alternating multilayer Langmuir−Blodgett films has been studied. The 11-CU fluorescence is quenched by energy transfer to 9-AS or 2-AS as judged by steady-state and picosecond time-resolved fluorescence measurements. The fluorescence decay curves of 11-CU in the films were analyzed in the framework of several models: (1) a general model for interlayer energy transfer, (2) a two-exponential decay, (3) a Förster model for energy transfer in a two-dimensional system, and (4) a stretched-exponential decay, characteristic of Förster energy transfer in self-similar fractal-like structures. The recovered decay parameters suggest an inhomogeneous mixing of the acceptor molecules in LB films leading to a two-phase system. The phase separation during compression of the acceptor monolayers forms regions of acceptor concentration about 3 times that of the intended and regions with very low acceptor concentration.

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“…Long-distance photoinduced electron transfer occurs in a molecular system where donor and acceptor are arranged with a well-defined molecular order, as is well-known in the photosynthetic reaction center. − Langmuir−Blodgett (LB) technique can be used to prepare an artificial molecular system where vectorial photoinduced energy transfer or electron transfer occurs, and the distance dependence of excited state quenching via energy and electron transfer has been investigated. − In LB monolayer films of cyanine dye and viologen with a spacer layer of fatty acid, for example, fluorescence quenching which results from a vectorial photoinduced interlayer electron transfer (PIET) from the excited state of cyanine dye to viologen was demonstrated. , The rate of PIET becomes faster exponentially with shortening the donor−acceptor distance, and the electron tunneling through a fatty acid was proposed. In relation not only to a control of photochemical reactions but also to a development of new materials having photoinduced function of electric property, it is interesting to know how external electric field influences the photochemical reaction in well-ordered molecular systems.…”

Section: Introductionmentioning

confidence: 99%

“…[1][2][3] Langmuir-Blodgett (LB) technique can be used to prepare an artificial molecular system where vectorial photoinduced energy transfer or electron transfer occurs, and the distance dependence of excited state quenching via energy and electron transfer has been investigated. [4][5][6][7][8][9][10][11][12] In LB monolayer films of cyanine dye and viologen with a spacer layer of fatty acid, for example, fluorescence quenching which results from a vectorial photoinduced interlayer electron transfer (PIET) from the excited state of cyanine dye to viologen was demonstrated. 7,8 The rate of PIET becomes faster exponentially with shortening the donor-acceptor distance, and the electron tunneling through a fatty acid was proposed.…”

Section: Introductionmentioning

confidence: 99%