Photoinduced intermolecular electron transfer between Coumarin dyes and electron donating solvents in cetyltrimethylammonium bromide (CTAB) micelles: evidence for Marcus inverted region

Chakraborty, Anjan; Chakrabarty, Debdeep; Hazra, Partha; Seth, Debabrata; Sarkar, Nilmoni

doi:10.1016/j.cplett.2003.10.105

Cited by 52 publications

(26 citation statements)

References 32 publications

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“…DMA is a very good electron donor, neutral in nature and sparingly soluble in aqueous solution [38,[54][55][56][57][58][59][60]. However, in the presence of CTAB micelles, the solubility of DMA has drastically increased.…”

Section: Reductive Quenching In Cationic Micelle Ctabmentioning

confidence: 98%

Photoinduced Electron Transfer Reactions of Ruthenium(II) Phenanthroline Complexes with Dimethylaniline in Aqueous and Micellar Media

Sangiliapillai¹,

Ramdass

Rajkumar³

et al. 2014

J Fluoresc

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Four [Ru(NN)(3)](2+) complexes (NN = polypyridine) with ligands of varying hydrophobicity with different charges +2, 0 and -4 were synthesized. The photophysics and photoinduced electron transfer reactions of these Ru(II)-complexes with dimethylaniline (DMA) as the quencher have been studied in aqueous medium and ionic and non-ionic micellar medium. The extent of binding of the complexes with the surfactant interface is evident from the calculated binding constant values (K). Dimethylaniline (DMA) being a neutral quencher, the hydrophobic and electrostatic interactions competing with one another and their combined effect with the surfactants were reported by observing the quenching rate constant (k(q)) values. The formation of anilinium cation radical in transient absorption spectrum confirms the excited state electron transfer reactions of ruthenium(II) complexes with dimethylaniline. The calculated rate constant values (k(q)) are in good agreement with the experimental k(q) values giving quantitative evidence for the bimolecular reductive quenching rate constant for the complexes with DMA. Pseudophase ion exchange model is successfully applied to analyse the quenching data.

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Section: Reductive Quenching In Cationic Micelle Ctabmentioning

confidence: 98%

Photoinduced Electron Transfer Reactions of Ruthenium(II) Phenanthroline Complexes with Dimethylaniline in Aqueous and Micellar Media

Sangiliapillai¹,

Ramdass

Rajkumar³

et al. 2014

J Fluoresc

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“…In a micelle [60][61][62] or inside a cyclodextrin cavity, 63 the donor (DMA) and the acceptor (coumarin dyes) stay very close and hence, PET in a micelle is expected to be almost as fast as that in neat DMA. Ghosh et al detected ultrafast components (<10 ps) of PET in a micelle 62 and in a O-hydroxypropylcyclodextrin cavity 63 using a femtosecond up-conversion set up.…”

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confidence: 99%

Ultrafast Dynamics in Biological Systems and in Nano-Confined Environments

Sahu

Mondal

Ghosh

et al. 2007

Bulletin of the Chemical Society of Japan

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Ultrafast chemical dynamics in a nano-confined system is very different from that in a bulk liquid. In this account, we give an overview on recent femtosecond study on dynamics of ultrafast chemical processes in the nanocavity of a biological system. Dynamics in a biological system crucially depends on the location of the fluorescent probe. We show that one can study solvation dynamics in different regions (i.e. spatially resolve) by variation of the excitation wavelength. We discuss two interesting cases of how structure affects dynamics. First, solvation dynamics of two protein folding intermediates of cytochrome c is found to be differ significantly in the ultrafast initial part (<20 ps). Second, methyl substitution of the OH group in a cyclodextrin is shown to slow down the initial part of solvation dynamics quite dramatically. The most interesting observation is the discovery of the ultraslow component of solvation dynamics which is 100-1000 times slower compared to bulk water. The electron-and proton-transfer processes in a nano-confined system are found to be markedly retarded because of slow solvation and structural constraints. Close proximity of the reactants in a confined system is expected to accelerate dynamics of bi-molecular processes. This is illustrated by ultrafast fluorescence resonance energy transfer (FRET) in %1 ps time scale between a donor and an acceptor in a micelle. Finally, it is demonstrated that the decay of fluorescence anisotropy provides structural information (e.g. size of a cyclodextrin inclusion complex) and may be used to detect formation of a nano-aggregate.

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“…Other types of aqueous micelles which have been investigated using coumarin fluorescence include triblock copolymer micelles, which have been extensively studied by Kumbhakar et al [79][80][81][82][83][84], Grant et al [85,86] and Ghosh et al [87] using C153 as well as other coumarins; various alkyltrimethylammonium bromide micelles [88][89][90]; Tween 20 [91]; and Brij-35 micelles [92].…”

Section: Coumarins As Fluorescent Probes Of Micellesmentioning

confidence: 99%

Molecular Mapping of Periodontal Tissues Using Infrared Microspectroscopy

Williams¹

2016

Spectroscopy

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Coumarins, as a family of molecules, exhibit a wide range of fluorescence emission properties. In many cases, this fluorescence is extremely sensitive to the local environment of the molecule, especially the local polarity and microviscosity. In addition, coumarins show a wide range of size, shape, and hydrophobicity. These properties make them especially useful as fluorescent probes of heterogeneous environments, such as supramolecular host cavities, micelles, polymers and solids. This article will review the use of coumarins to probe such heterogeneous systems using fluorescence spectroscopy.

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Photoinduced intermolecular electron transfer between Coumarin dyes and electron donating solvents in cetyltrimethylammonium bromide (CTAB) micelles: evidence for Marcus inverted region

Cited by 52 publications

References 32 publications

Photoinduced Electron Transfer Reactions of Ruthenium(II) Phenanthroline Complexes with Dimethylaniline in Aqueous and Micellar Media

Photoinduced Electron Transfer Reactions of Ruthenium(II) Phenanthroline Complexes with Dimethylaniline in Aqueous and Micellar Media

Ultrafast Dynamics in Biological Systems and in Nano-Confined Environments

Molecular Mapping of Periodontal Tissues Using Infrared Microspectroscopy

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