Internal rotation in auramine O

Pennathur, Gautam; Harriman, Anthony

doi:10.1039/ft9949000697

Cited by 49 publications

(54 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…We first investigated the effect of confinement on the relaxation dynamics of AuO. AuO is a widely used viscosity probe molecule, and its relaxation process is remarkably affected by the surrounding environment 39,40. Photoexcited AuO relaxes via two intermediate states, that is, a first‐formed emissive locally excited (LE) state and a nonemissive twisted intramolecular charge transfer‐like (TICT‐like) state (Fig.…”

Section: Relaxation Of Photoexcited Auramine O In a Water/aot/n‐heptamentioning

confidence: 99%

Ultrafast dynamics of a solution in spatially restricted environments studied by photothermal spectroscopies

Hirose

Yui

Sawada

2004

The Chemical Record

View full text Add to dashboard Cite

The ultrafast dynamics of a solution in spatially restricted environments was studied by using the ultrafast transient lens (UTL) method. The UTL method is used to monitor the molecular dynamics of a solution by means of a change in the refractive index, which is advantageous for investigating the molecular dynamics of restricted systems. We investigated the photoisomerization of azobenzene derivatives in cyclodextrin nanocavities and revealed how the confinement affects the photoisomerization dynamics and yields. We also studied the relaxation dynamics of photo-excited auramine O (AuO) in a water/aerosol-OT/n-heptane reversed micelle. Both the perturbed properties of the included water and the interactions between AuO and the interface of the reversed micelle strongly appeared to affect the relaxation dynamics. At the same time, we observed a change in the refractive index suggesting a structural change of the micelles in the picosecond region that could not be detected by transient absorption spectroscopy. In addition, we developed the total internal reflection UTL (TIR-UTL) method to monitor the ultrafast molecular dynamics at the liquid interface. The relaxation dynamics of photoexcited AuO at the silica/water interface were observed with subpicosecond time resolution, and it was revealed that the interaction with the interface strongly inhibited the relaxation process. These results demonstrated the advantages of the UTL method for investigating the molecular dynamics of a solution in spatially restricted environments.

show abstract

Section: Relaxation Of Photoexcited Auramine O In a Water/aot/n‐heptamentioning

confidence: 99%

Ultrafast dynamics of a solution in spatially restricted environments studied by photothermal spectroscopies

Hirose

Yui

Sawada

2004

The Chemical Record

View full text Add to dashboard Cite

show abstract

“…3(a)). The fluorescence lifetime for Auramine O is smaller than 130 ps 36,37 which ensure an essentially instantaneous response time compared to the typical hydrodynamic timescale of the experiments. In the second case, the molecule is excited to a TICT state and returns to the ground state through (nonradiative) vibrational relaxation because of the low TICT S 1 − S 0 energy gap (Fig.…”

Section: A Molecular Probementioning

confidence: 99%

Reconstruction by fluorescence imaging of the spatio-temporal evolution of the viscosity field in Hele-Shaw flows

et al. 2014

View full text Add to dashboard Cite

We study the spatio-temporal evolution of the viscosity field during stable and unstable radial flows of glycerol-water solutions in a horizontal Hele-Shaw cell where a localized temperature gradient is imposed. The viscosity field is reconstructed from the measurement of the fluorescence emitted by a viscosity-sensitive molecular probe (Auramine O). For an immiscible flow, the viscosity and temperature fields are obtained accurately. For miscible displacements, we show how the interplay between the viscosity changes of both fluids and the variation of the fluid thickness in the gap prevents obtaining strict quantitative reconstruction of the viscosity field. We explain how the reconstructed viscosity field can nevertheless be interpreted to obtain information about the fluid thickness and the local viscosity and temperature.

show abstract

“…It is suggested, therefore, that the AM molecule interacts with C12-LPA-LPA in the micelle more strongly than C12-DPA-LPA. It is known that after AM molecules bind to anionic substrates like deoxyribonucleic acid, the fluorescence yield increases slightly 31,33) . On the other hand, binding of AM to a certain protein, which has a particular site for that dye, bring about a dramatic increase in fluorescence.…”

mentioning

confidence: 99%

“…It is very surprising that the fluorescence intensity of AM, which is not an optical isomer, is sensitively affected by the difference in chirality of one phenylalanine residue of the dipeptide-type surfactant. To explain the fluorescence properties of AM, it is suggested that the fluorescence emission process of excited AM competes with the internal conversion process via an intermolecular twisting motion of the dimethylaminophenyl groups of AM 30,31) . In other words, suppressing the twisting motion of AM increases its fluorescence intensity.…”

mentioning

confidence: 99%

Effect of Stereochemistry on the Molecular Aggregation of Phenylalanine Dipeptide-type Surfactants

et al. 2008

View full text Add to dashboard Cite

The aggregation behaviors of three stereoisomers of tetramethylammonium N-dodecanoyl phenylalanylphenylalaninate in dilute aqueous solution were investigated. From surface tension, fluorescence intensity using probes, and heat of dilution measurements, it was suggested that the critical aggregation concentration was the same between the enantiomers, but was obviously different between the diastereomers. It was also found that these surfactants formed large aggregates at lower concentrations. These large aggregates were then transformed to micelles at higher concentrations similarly to the potassium N-acyl phenylalaninate system. Furthermore, the fluorescence intensity of auramine increased strikingly in the N-dodecanoyl-L-phenylalanyl-L-phenylalanine (homo-chiral dipeptide-type surfactant) system. The fluorescence intensity of auramine in the aggregate of homo-chiral dipeptide-type surfactant was 20 times larger than that in the hetero-chiral dipeptide-type surfactant.

show abstract

Internal rotation in auramine O

Cited by 49 publications

References 22 publications

Ultrafast dynamics of a solution in spatially restricted environments studied by photothermal spectroscopies

Ultrafast dynamics of a solution in spatially restricted environments studied by photothermal spectroscopies

Reconstruction by fluorescence imaging of the spatio-temporal evolution of the viscosity field in Hele-Shaw flows

Effect of Stereochemistry on the Molecular Aggregation of Phenylalanine Dipeptide-type Surfactants

Contact Info

Product

Resources

About