Raman scattering spectra of Aerosol-OT homologous sodium dialkylsulfosuccinates and the environment of their hydrophobic chains |
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Authors: | Y Nagasoe N Ichiyanagi H Okabayashi S Nave J Eastoe C J O'Connor |
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Institution: | (1) Department of Applied Chemistry Nagoya Institute of Technology Gokiso-cho, Showa-ku Nagoya 466-8555 Japan, JP;(2) School of Chemistry University of Bristol, Cantock's Close Bristol BS8 1TS, UK, GB;(3) Department of Chemistry The University of Auckland Private Bag 92019, Auckland 1 New Zealand, NZ |
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Abstract: | A homologous series of sodium dialkylsulfosuccinates (SDAS) has been synthesized with various chain lengths (dibutyl, dihexyl,
diheptyl, dioctyl, dinonyl, didecyl, diundecyl and didodecyl). These compounds are straight-chain analogues for Aerosol-OT.
Raman scattering spectra have been recordered for these SDAS compounds, both in the solid state and in aqueous solutions.
These spectra are analyzed in detail in the CH stretch and CH2 deformation regions, and the results depend specifically on the length of the hydrocarbon chain. In particular, the longitudinal
accordion-like vibrational modes coming from the all-trans n-alkyl chains have been investigated. For the SDAS dihydrates, all hydrocarbon chains take up an extended form, whereas for
the monohydrates the tails tend to become disordered at the CH2-CH2 single bond close to the terminal methyl groups. It has also been confirmed that for the concentrated aqueous SDAS (sodium
dibutylsulfosuccinate – sodium dioctylsulfosuccinate) samples preferential stabilization of the extended conformation of the
hydrocarbon chain may occur.
Received: 23 February 1999 Accepted: 10 May 1999 |
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Keywords: | Raman spectra Sodium dialkylsulfosuccinates Hydrophobic chains Environment |
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