6533b82bfe1ef96bd128d769
RESEARCH PRODUCT
Gas phase infrared multiple photon dissociation spectra of positively charged sodium bis(2-ethylhexyl)sulfosuccinate reverse micelle-like aggregates
Vincenzo Turco LiveriJos OomensGiel BerdenLeopoldo CerauloGianluca Giorgisubject
Spectrophotometry InfraredAnalytical chemistryInfrared spectroscopy010402 general chemistryPhotochemistry01 natural sciencesMicelleDissociation (chemistry)Fragmentation (mass spectrometry)IRMPD gas phase AOTMaterials ChemistryMoleculeInfrared multiphoton dissociationPhysical and Theoretical ChemistryMicellesSettore CHIM/02 - Chimica Fisicachemistry.chemical_classificationDioctyl Sulfosuccinic AcidPhotonsChemistryLasers010401 analytical chemistryIntermolecular force0104 chemical sciencesSurfaces Coatings and FilmsGasesCounteriondescription
The capability of infrared multiple photon dissociation (IRMPD) spectroscopy to gain structural information on surfactant-based supramolecular aggregates has been exploited to elucidate intermolecular interactions and local organization of positively charged sodium bis(2-ethylhexyl)sulfosuccinate (AOTNa) aggregates in the gas phase. A detailed analysis of the stretching modes of the AOTNa CO and SO(3)(-) head groups allows one to directly probe their interactions with sodium counterions and to gain insight in their organization within the aggregate. Similarities and differences of the IRMPD spectra as compared to the infrared absorption spectrum of micellized AOTNa in CCl(4) have been analyzed. They strongly suggest a reverse micelle-like organization of AOTNa charged aggregates in the gas phase. Apart from low-abundance fragmentation channels of the AOTNa (molecule) itself, the main dissociation pathway of singly charged surfactant aggregates is the loss of neutral surfactant molecules, while doubly charged aggregates dissociate preferentially by charge separation forming singly charged species. In both cases, decomposition leads to the formation of the most energetically stable charged fragments.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2011-01-01 | The journal of Physical Chemistry. B |