The pH dependent adsorption of Coumarin 343 at the water/dichloroethane interface

Pant, D.D.; Guennec, M. Le; Illien, Bertrand; Girault, Hubert H.

doi:10.1039/b404329d

Cited by 21 publications

(34 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Using the surface sensitive technique of second harmonic generation (SHG) and QELS we have studied the adsorption behavior of C343 at the water/DCE interface and the results have already been reported. 24 Briefly, the SHG intensity was monitored as a function of bulk aqueous concentration of C343. The plot of square root of second harmonic intensity against the concentration of C343 yielded the adsorption isotherm of the molecule.…”

Section: Resultsmentioning

confidence: 99%

“…At pH 9 and pH 10, the dye was present in both the protonated and deprotonated form at the interface, whereas at pH 11, the dye molecules were present in the H-aggregated deprotonated form at the interface. 24 The pK a value at the interface was greater than eight, some four units greater than the pK a of C343 in bulk aqueous solution, and was attributed to the intramolecular hydrogen bonding along with the aggregation of the dye molecules at the interface. In agreement with our SHG measurements, 24 we conclude that the observed red shift in the emission spectrum in the present study is due to the aggregation of C343 dye molecules at the water/DCE interface.…”

Section: Steady State Measurementsmentioning

confidence: 92%

“…24 The pK a value at the interface was greater than eight, some four units greater than the pK a of C343 in bulk aqueous solution, and was attributed to the intramolecular hydrogen bonding along with the aggregation of the dye molecules at the interface. In agreement with our SHG measurements, 24 we conclude that the observed red shift in the emission spectrum in the present study is due to the aggregation of C343 dye molecules at the water/DCE interface. This conclusion is further supported by the TIR fluorescence lifetime measurements at the water/DCE interface and discussed in the following sections.…”

Section: Steady State Measurementsmentioning

confidence: 92%

“…Second, the strong interactions among the closely packed dye molecules at the interface could result in red shift in the emission spectrum. However, the adsorption isotherm we have studied for C343 molecules in a previous study 24 followed a simple Langmuir adsorption isotherm which has ruled out the strong interactions among the adsorbed dye molecules at the interface. Third, the red shift in fluorescence spectrum could be due to the protonation of dye at the interface.…”

Section: Steady State Measurementsmentioning

confidence: 99%

“…24 The anomalous pH dependence of SHG signal from C343 at the water/DCE interface was attributed to the intramolecular hydrogen bonding along with the aggregation of the dye molecules at the interface.…”

Section: Introductionmentioning

confidence: 99%

See 4 more Smart Citations

Time-resolved total internal reflection fluorescence spectroscopy : Part I. Photophysics of Coumarin 343 at liquid/liquid interface

Pant

2005

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

Pico-second time-resolved time-correlated single photon counting (TCSPC) technique under the total internal reflection (TIR) condition has been used to study the photophysical properties of Coumarin 343 (C343) dye molecules adsorbed at the water/1,2-dichloroethane (DCE) interface. The fluorescence decay profile of C343 under TIR condition at the water/DCE interface was non-exponential and fitted to the double exponential decay function with the fluorescence lifetimes 0.3 and 3.6 ns, which proved the existence of two different forms of C343 species having largely different lifetimes at the interface. The longer fluorescence lifetime component of C343 at the interface is attributed to the emission from the monomeric form of the dye molecules and the shorter lifetime component is due to the aggregation of dye molecules. The penetration depth dependence of decay curves indicated no change in the fluorescence lifetime components, however, the amplitude corresponding to the lifetime of aggregate increased and the amplitude corresponding to the lifetime of monomer decreased with the decrease in penetration depth of the aqueous phase from the interface. Aggregation is significant in the interfacial layer. The decrease in monomer lifetime at the interface compared to that in the bulk solution is interpreted in terms of excitation energy migration between the dye molecules.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Steady State Measurementsmentioning

confidence: 92%

Section: Steady State Measurementsmentioning

confidence: 92%

Section: Steady State Measurementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Time-resolved total internal reflection fluorescence spectroscopy : Part I. Photophysics of Coumarin 343 at liquid/liquid interface

Pant

2005

Phys. Chem. Chem. Phys.

Self Cite

View full text Add to dashboard Cite

show abstract

Novel interface‐selective even‐order nonlinear spectroscopy

Yamaguchi

Tahara²

2008

Laser & Photonics Reviews

View full text Add to dashboard Cite

New interface-selective second-(χ (2) ) and fourthorder (χ (4) ) nonlinear spectroscopic techniques have been developed. χ (2) electronic sum frequency generation (ESFG) spectroscopy enables us to obtain interfacial electronic spectra with an unprecedented high signal-to-noise ratio and dense wavelength data points. Frequency-domain χ (4) Raman spectroscopy provides vibrational spectra of interfaces for a very wide wavenumber range covering the whole fingerprint region. Because these new even-order electronic and vibrational nonlinear spectroscopies utilize only visible and/or near-infrared laser pulses, they are applicable to a variety of "buried" interfaces that are not readily accessed by the other existing methods.

show abstract

Surface second harmonic generation from coumarin 343 dye-attached TiO2 nanoparticles at liquid–liquid interface

Pant

Joshi

2011

J Nanopart Res

Self Cite

View full text Add to dashboard Cite

The nonlinear optical properties of coumarin 343 (C343) dye-attached TiO 2 nanoparticles in the size range 5-8 nm adsorbed at the interface of water/1,2-dichloroethane have been studied by using the surface second harmonic generation technique. No second harmonic (SH) response was observed from the bare TiO 2 nanoparticles adsorbed at the interface, however, a strong SH response was measured from the dye molecules attached at the surfaces of the nanoparticles. The increase in the SH intensity with the increase of TiO 2 nanoparticle concentration in the aqueous solution of C343 is mainly due to the prealignment of the dye molecules at the surfaces of nanoparticles and is partly due to the third-order polarization contribution of the nanoparticles to the observed total SH response.

show abstract

The pH dependent adsorption of Coumarin 343 at the water/dichloroethane interface

Cited by 21 publications

References 37 publications

Time-resolved total internal reflection fluorescence spectroscopy : Part I. Photophysics of Coumarin 343 at liquid/liquid interface

Time-resolved total internal reflection fluorescence spectroscopy : Part I. Photophysics of Coumarin 343 at liquid/liquid interface

Novel interface‐selective even‐order nonlinear spectroscopy

Surface second harmonic generation from coumarin 343 dye-attached TiO2 nanoparticles at liquid–liquid interface

Contact Info

Product

Resources

About