Characterizing interfacial friction in bis(2-ethylhexyl) sodium sulfosuccinate reverse micelles from photoisomerization studies of carbocyanine derivatives

Journal Article · Fri Jan 14 00:00:00 EST 2011 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3529013· OSTI ID:21559977

Gangamallaiah, V; Dutt, G B ^[1]

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1. Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085 (India)

Photoisomerization of two carbocyanine derivatives has been examined in bis(2-ethylhexyl) sodium sulfosuccinate (AOT) reverse micelles to understand the factors that govern this process in the interfacial region of organized assemblies. To this effect, fluorescence lifetimes and quantum yields of 3,3{sup '}-diethyloxadicarbocyanine iodide and merocyanine 540 have been measured in AOT/isooctane/water and AOT/cyclohexane/water reverse micellar systems as a function of the mole ratio of water to the surfactant, W. The nonradiative rate constants, which have been identified as the rates of photoisomerization for these solutes, were obtained from the experimentally measured parameters. The steady rise and subsequent saturation observed in the nonradiative rate constants upon increasing W has been rationalized in terms of micellar packing. An inverse correlation has been obtained between the nonradiative rate constants and the critical packing parameter, indicating that the interfacial friction experienced by the solute molecule is essentially described by this parameter.

• OSTI ID: 21559977
• Journal Information: Journal of Chemical Physics, Vol. 134, Issue 2; Other Information: DOI: 10.1063/1.3529013; (c) 2011 American Institute of Physics; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
AUGMENTATION
COLLOIDS
CORRELATIONS
CYCLOHEXANE
FLUORESCENCE
FRICTION
IODIDES
ISOMERIZATION
MICELLAR SYSTEMS
MOLECULES
PACKINGS
PHOTOCHEMISTRY
REACTION KINETICS
SATURATION
SODIUM
SOLUTES
STOWING
SURFACTANTS
WATER
ALKALI METALS
ALKANES
CHEMICAL REACTIONS
CHEMISTRY
CYCLOALKANES
DISPERSIONS
ELEMENTS
EMISSION
HALIDES
HALOGEN COMPOUNDS
HYDROCARBONS
HYDROGEN COMPOUNDS
IODINE COMPOUNDS
KINETICS
LUMINESCENCE
METALS
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PHOTON EMISSION