Dielectric Relaxation and Solvation Dynamics of Water in Complex Chemical and Biological Systems

Nandi, Nilashis; Bhattacharyya, Kankan; Bagchi, Biman

doi:10.1021/cr980127v

Cited by 890 publications

(1,029 citation statements)

References 460 publications

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“…Fourth, the slow component of C(t), which has time constants of 8, 6, and 3 ps, respectively, in the TX-100, DTAB, and SDS micelles, shows reasonable agreement with results from previous studies, 54,60 which has been assigned to solvation of water molecules that are bound to the surface of the micelle by hydrogen bonding or the head group-water interactions. [40][41][42][43][44] Lastly, the constant offset observed in the C(t) of curcumin in the three micelles, which is expressed as a 3 in Table 2, indicates the presence of a decay component with a time constant that is vastly longer than the 10 ps time window of the solvation dynamics studies. Although this decay component of C(t) is too long to be resolved with our solvation dynamics investigations, it has been established in previous studies that C(t) has a long-lived component in micelles, with time constants ranging from 165 to 300 ps.…”

Section: Uv-vis Absorption and Emission Spectra Of Curcumin In Micellesmentioning

confidence: 98%

“…Solvation dynamics in micellar media is currently an intense area of research. [40][41][42][43][54][55][56][57][58][59][60][61][62] Surfactant micelles are excellent model systems for more complex biomembranes, and investigations on solvation dynamics in micelles provide critical insight into the behavior of small molecules in biomembranes. First of all, in our study, it is noteworthy that for each of the micelles, the value of the time constant τ 2 of C(t), as summarized in Table 2, is virtually identical within experimental error to that of the fast component of the fluorescence upconversion results shown in Figure 3 and Table 1.…”

Section: Uv-vis Absorption and Emission Spectra Of Curcumin In Micellesmentioning

confidence: 99%

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Excited-State Intramolecular Hydrogen Atom Transfer of Curcumin in Surfactant Micelles

et al. 2010

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Femtosecond fluorescence upconversion experiments were performed on the naturally occurring medicinal pigment, curcumin, in anionic, cationic, and neutral micelles. In our studies, the micelles are composed of sodium dodecyl sulfate (SDS), dodecyl trimethyl ammonium bromide (DTAB), and triton X-100 (TX-100). We demonstrate that the excited-state kinetics of curcumin in micelles have a fast (3−8 ps) and slow (50−80 ps) component. While deuteration of curcumin has a negligible effect on the fast component, the slow component exhibits a pronounced isotope effect of ∼1.6, indicating that micelle-captured curcumin undergoes excited-state intramolecular hydrogen atom transfer. Studies of solvation dynamics of curcumin in a 10 ps time window reveal a fast component (≤300 fs) followed by a 8, 6, and 3 ps component in the solvation correlation function for the TX-100, DTAB, and SDS micelles, respectively. October 23, 2009; ReVised Manuscript ReceiVed: January 4, 2010 Femtosecond fluorescence upconversion experiments were performed on the naturally occurring medicinal pigment, curcumin, in anionic, cationic, and neutral micelles. In our studies, the micelles are composed of sodium dodecyl sulfate (SDS), dodecyl trimethyl ammonium bromide (DTAB), and triton X-100 (TX-100). We demonstrate that the excited-state kinetics of curcumin in micelles have a fast (3-8 ps) and slow (50-80 ps) component. While deuteration of curcumin has a negligible effect on the fast component, the slow component exhibits a pronounced isotope effect of ∼1.6, indicating that micelle-captured curcumin undergoes excited-state intramolecular hydrogen atom transfer. Studies of solvation dynamics of curcumin in a 10 ps time window reveal a fast component (e300 fs) followed by a 8, 6, and 3 ps component in the solvation correlation function for the TX-100, DTAB, and SDS micelles, respectively. Keywords

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Section: Uv-vis Absorption and Emission Spectra Of Curcumin In Micellesmentioning

confidence: 98%

Section: Uv-vis Absorption and Emission Spectra Of Curcumin In Micellesmentioning

confidence: 99%

Excited-State Intramolecular Hydrogen Atom Transfer of Curcumin in Surfactant Micelles

et al. 2010

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“…13 Single frequency 57 terahertz transmission spectroscopy has also been applied to 58 the study of hydration water of peptides 12 and proteins. 19,20 59 This approach suggested that a dynamical solvation slowed by up to a factor of 8 in comparison to those in bulk 16 water. The most marked slowdown was observed for the most hydrophilic protein studied, bovine serum albumin, whereas the most 17 hydrophobic protein, trypsin, had a slightly smaller effect.…”

Section: à12mentioning

confidence: 99%

Water Dynamics at Protein Interfaces: Ultrafast Optical Kerr Effect Study

2011

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water. The most marked slowdown was observed for the most hydrophilic protein studied, bovine serum albumin, whereas the most 17 hydrophobic protein, trypsin, had a slightly smaller effect. The terahertz Raman spectra of these protein solutions resemble those of 18 pure water up to a concentration of 5 wt %, above which a new feature appears at ∼80 cm À1 , which is assigned to a bending of the 19 protein amide chain.

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“…the dynamic response of a surrounding solvent (or more generally an environment) to a charge redistribution of a solute upon its electronic excitation, has attracted considerable attention over the years, both experimentally and theoretically [1][2][3][4][5][6][7][8][9] . From the experimental standpoint, its study has mostly centered up to now on the electronic excitation of fluorescent probes [10][11][12] , which generally entails charge redistribution on the solute.…”

Section: Introductionmentioning

confidence: 99%

Solvation Dynamics in Liquid Water. 1. Ultrafast Energy Fluxes

Rey

Hynes

2015

J. Phys. Chem. B

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Solvation dynamics in liquid water is addressed via nonequilibrium energy transfer pathways activated after a neutral atomic solute acquires a unit charge, either positive or negative. It is shown that the well-known nonequilibrium frequency shift relaxation function can be expressed in a novel fashion in terms of energy fluxes, providing a clearcut and quantitative account of the processes involved. Roughly half of the initial excess energy is transferred into hindered rotations of first hydration shell water molecules, i.e. librational motions, specifically those rotations around the lowest moment of inertia principal axis. After integration over all water solvent molecules, rotations account for roughly 80 % of the energy transferred, while translations have a secondary role; transfer to intramolecular water stretch and bend vibrations is negligible. This picture is similar to that for relaxation of a single vibrationally or rotationally excited water molecule in neat liquid water, although solvation relaxation is more non-local. In addition, we find a remarkable independence of the main relaxation channels on the newly created charges sign. Although the methodology is applied here to the simplest solute case, the approach is rather general, and it should be at least equally useful in more realistic and complex scenarios.

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Dielectric Relaxation and Solvation Dynamics of Water in Complex Chemical and Biological Systems

Cited by 890 publications

References 460 publications

Excited-State Intramolecular Hydrogen Atom Transfer of Curcumin in Surfactant Micelles

Excited-State Intramolecular Hydrogen Atom Transfer of Curcumin in Surfactant Micelles

Water Dynamics at Protein Interfaces: Ultrafast Optical Kerr Effect Study

Solvation Dynamics in Liquid Water. 1. Ultrafast Energy Fluxes

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