Dynamics of Solvent and Rotational Relaxation of Glycerol in the Nanocavity of Reverse Micelles

Chakraborty, Anjan; Seth, Debabrata; Setua, Palash; Sarkar, Nilmoni

doi:10.1021/jp056650c

Cited by 37 publications

(58 citation statements)

References 103 publications

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“…With deep-UVe xcitation, also ah igher lying electronic state is reached, but the emission spectra in Figure 1b impart relaxation to the lowest lying excited state for both UV wavelengths. [80,81] The value of t 2 = 204 ps found for PTCi ng lycerol might correspond to these observations. The involvement of solvation can be inferred from the TCSPC data in the viscouss olvents ethylene glycol and glycerolw here af urther component (t 2 in Ta ble 1) had to be included for satisfactorily fitting the data.…”

Section: Relaxation (Decay Times T 2 and T 3 )supporting

confidence: 67%

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Ultrafast Dynamics of a Fluorescent Tetrazolium Compound in Solution

et al. 2017

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Tetrazolium salts are exploited in various fields of research by virtue of their low reduction potentials. Increasingly, associated applications also attend to the photochemical and luminescence properties of these systems. Here, we investigate the photoinduced dynamics of phenyl-benzo[c]tetrazolo-cinnolinium chloride (PTC), one of the very few known fluorescent tetrazolium compounds, by using time-correlated single-photon counting, femtosecond fluorescence upconversion, and ultrafast transient absorption spectroscopy. PTC is generated photochemically by ultraviolet illumination of 2,3,5-triphenyl-tetrazolium chloride (TTC) in various alcohols. Time-resolved fluorescence measurements on PTC with different excitation wavelengths disclose biphasic solvation and vibrational relaxation dynamics. Depending on the solvent, the emission behavior of PTC is characterized by quantum yields on the order of several tens of percent and corresponding excited-state lifetimes of several hundreds of picoseconds. The radiative rate is basically constant for the studied alcohols, whereas the rate of the competing non-radiative process is sensitive to the solvent polarity. Hence, we discuss the possible involvement of intermediate radicals and further presumptive reaction pathways pursued after photoexcitation of PTC.

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Section: Relaxation (Decay Times T 2 and T 3 )supporting

confidence: 67%

“…The average solvation time of glycerol determined with various coumarin dyes is on the order of several hundred picoseconds with the exact value depending on the solute. [80,81] The value of t 2 = 204 ps found for PTCi ng lycerol might correspond to these observations.…”

Section: Relaxation (Decay Times T 2 and T 3 )supporting

confidence: 67%

Ultrafast Dynamics of a Fluorescent Tetrazolium Compound in Solution

et al. 2017

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“…The slow relaxation of GLY molecules within neat GLY makes the entire solvation time much slower (B500-1000 ps) compared to the bulk water (Bfew ps). [35][36][37] In contrast to the GLY, DMSO is known as a fast solvent. The typical solvation time within this solvent is only B3 ps.…”

Section: Steady State Spectra and Time Resolved Fluorescence Stokes S...mentioning

confidence: 99%

Probe dependent anomalies in the solvation dynamics of coumarin dyes in dimethyl sulfoxide–glycerol binary solvent: confirming the local environments are different for coumarin dyes

Koley

Kaur

Ghosh

2014

Phys. Chem. Chem. Phys.

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The solvation dynamics of coumarin dyes in dimethyl sulfoxide (DMSO)-glycerol (GLY) binary mixtures were studied across the GLY concentrations. Three coumarin dyes with widely different hydrophobicities were used for probing the entire polarity regions of this solvent mixture. Multiple anomalous concentration regions with significantly slow solvation times were detected from all three coumarin dyes. However, their precise positions were found to be probe molecule dependent. The solvation dynamics of the moderately hydrophobic dye coumarin 480 (C480) maintain a plateau region with a similar solvation time (∼550 ps) with the increase in GLY concentration until X(GLY) (the mole fraction of glycerol) reaches 0.5. This plateau region is followed by a sudden slowdown (to ∼975 ps) on the addition of more GLY to the DMSO-GLY mixture, and then this slow region persists from X(GLY)∼ 0.55 to 0.65 (peak at 0.6). On further addition of GLY (X(GLY) > 0.7), the solvation dynamics again become slower to ∼828 ps (at X(GLY)∼ 0.8) from ∼612 ps (at X(GLY)∼ 0.7). For very high GLY-content samples (X(GLY) > 0.85), the solvation times remain similar on further changes of the GLY concentrations. In contrast to C480, the most hydrophobic dye coumarin 153 (C153) shows a linear increase of solvation time in the DMSO-GLY mixture, from 102 ps (at X(GLY)∼ 0.1) to 946 ps (at X(GLY)∼ 0.9) with increase in GLY concentration, except for the concentration region, X(GLY)∼ 0.45-0.55 (peak at 0.5), where a substantial slowdown of the solvation time is observed. The highly hydrophilic probe coumarin 343 (C343) demonstrates multiple concentration regions (X(GLY)∼ 0.05-0.10, 0.25-0.35 and 0.55-0.65) where the solvation dynamics are significantly retarded. The presence of probe dependent anomalies in the DMSO-GLY mixture is a clear indication of there being different locations of probe molecules within this solvent mixture. We assume that the slowing-down of the solvation time could be a reflection of several aspects, including the inherit inhomogeneity, intriguing structural transformations in the DMSO-GLY mixture, percolation among DMSO molecules and network structure formation, where DMSO:GLY complexes contribute to the dynamical features.

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“…10 In addition, Seth and co-workers published a series of reports on solvent and rotational relaxation of coumarin fluorescence probes in various IL-containing microemulsions or micellar solutions. 29,30 The self-assembled structures of surfactants with ILs have shown different advantages over the traditional ones notably in the preparation of nanostructures. A recent study has shown that IL-based microemulsions can be used to produce polymer nanoparticles, gels, and open-cell porous materials.…”

Section: Introductionmentioning

confidence: 99%