Influence of surfactants on the excited state photophysics of 4-nitro-1-hydroxy-2-naphthoic acid

Sahoo, Dibakar; Chakravorti, S.

doi:10.1039/c0pp00104j

Cited by 6 publications

(7 citation statements)

References 37 publications

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“…We know that the water molecules present inside the core of reverse micelle are less polar compared to the bulk water molecules. 53,54 With the gradual addition of water in the reverse micelles the uorescence emission peak gradually undergoes red shiing as the polarity of the water pool increases. Moreover, when the dyemacrocycle complex is entrapped inside the core of reverse micelle the dye faces more restricted environment inside the core of reverse micelle.…”

Section: Methodsmentioning

confidence: 99%

Influence of double confinement on photophysics of 7-(diethylamino)coumarin-3-carboxylic acid in water/AOT/isooctane reverse micelles

2014

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The effect of double confinement on the photophysics of 7-(diethylamino)coumarin-3-carboxylic acid (7-DCCA) inside the water pool of water/AOT/isooctane reverse micelles has been reported in this study. At first a supramolecular host-guest complex was formed in water between 2-hydroxypropyl-gcyclodextrin (HP-g-CD) and 7-DCCA. Then the aqueous solution of this complex was used to form reverse micelles at any particular w 0 value (w 0 ¼ [water]/[surfactant]). We have used sodium dioctyl sulfosuccinate (AOT) as surfactant and isooctane as non-polar solvent to prepare reverse micelles. A comparative study between double confinement system and the single confinement system, where the 7-DCCA molecule was incorporated inside the core of the water/AOT/isooctane reverse micelles, was done. We have used the steady state absorption and fluorescence emission techniques to highlight the significant shift of the spectral behaviour of the 7-DCCA due to the double encapsulation of the dye in the nanopool of the reverse micelles. More affirmation has been achieved by the use of time resolved fluorescence emission spectroscopy. The study of solvation dynamics and rotational relaxation dynamics was used as tools to investigate the effect of double encapsulation on the excited state dynamics of the probe molecule. These excited state dynamics clearly show that even at the highest w 0 value studied here, the excited state dynamics of the doubly confined dye are significantly different from those of the single confined dye in the reverse micelle. The higher values of fluorescence emission decay time, rotational relaxation and solvent relaxation times in the doubly confined system compared to those of the single confined system at different w 0 values proved the existence of the supramolecular host-guest complex inside the core of the water/AOT/isooctane reverse micelle.

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Section: Methodsmentioning

confidence: 99%

Influence of double confinement on photophysics of 7-(diethylamino)coumarin-3-carboxylic acid in water/AOT/isooctane reverse micelles

2014

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“…The quality of the fit was determined in terms of a Durbin-Watson (DW) parameter, weighted residuals and reduced χ 2 values. The time-resolved emission spectra (TRES) and time-resolved area normalized emission spectra (TRANES) have been computed from the fluorescence decays of Dapsone across the emission spectrum at an interval of 5 nm. − …”

Section: Methodsmentioning

confidence: 99%

Revisit of 4,4′-Diaminodiphenyl Sulfone Photophysics in Different Solvents

Bhattacharya

Sahoo

Chakravorti

2012

Ind. Eng. Chem. Res.

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This paper aims at getting the origin of dual emission of 4,4′-diaminodiphenyl sulfone (Dapsone) in various solvents using steady state and time-resolved emission spectroscopy in conjunction with ground and excited state optimized geometry calculations in gaseous phase and in solvents. The dual fluorescence in different solvents and a distinctive bathochromic spectral shift of the low energy band in polar solvents indicate the possibility of intramolecular charge transfer (ICT) from the donor site (−NH 2 ) to the acceptor moiety in the excited state. Time-resolved emission spectra (TRES) and more precisely timeresolved area normalized emission spectra (TRANES) depict the evolution of the dynamics of excited state species and the charge transfer. Hindrance of rotational relaxation in restricted environments causes intensified charge transfer emission quantum yield. A plausible model for excited state deactivation through ICT has been proposed on the basis of both theoretical and experimental findings. The observed results also necessitate to conceive the involvement of a nonradiative deactivation channel in an unrestricted environment which seems to regulate the ICT emission and photophysics of the probe.

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“…Since the charge transfer emission of Dapsone is polarity sensitive [26], we use this probe to get an estimate of the polarity of the local environment in reverse micelles with the help of often-used solvent polarity parameter, E T (30) [37][38][39]. From the calibration curve (Supplementary Figure 6) we have determined local polarity around probe inside RM [ Figure 3] which shows that E T (30) value increases rapidly up to W = 30 and after that it does not change significantly.…”

Section: Micropolarity and Microviscositymentioning

confidence: 99%

Spectral features of 4,4-diaminodiphenyl sulfone in anionic and cationic inverted micelles

Bhattacharya¹,

Chakravorti²

2013

Chemical Physics Letters

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Influence of surfactants on the excited state photophysics of 4-nitro-1-hydroxy-2-naphthoic acid

Cited by 6 publications

References 37 publications

Influence of double confinement on photophysics of 7-(diethylamino)coumarin-3-carboxylic acid in water/AOT/isooctane reverse micelles

Influence of double confinement on photophysics of 7-(diethylamino)coumarin-3-carboxylic acid in water/AOT/isooctane reverse micelles

Revisit of 4,4′-Diaminodiphenyl Sulfone Photophysics in Different Solvents

Spectral features of 4,4-diaminodiphenyl sulfone in anionic and cationic inverted micelles

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