Proton chemical exchange in aqueous solutions of dodecylammonium chloride: Effects of micellar aggregation
2007 (English)In: The Journal of Physical Chemistry C, ISSN 1932-7447, E-ISSN 1932-7455, Vol. 111, no 43, 15613-15619 p.Article in journal (Refereed) Published
Proton chemical exchange was studied in aqueous solutions of dodecylammonium chloride (DDAC1) for two selected concentrations, 18 and 33 wt %. The Fourier transform Carr-Pureell-Meiboom-Gill (CPMG) NMR method combined with the Carver and Richards model for T-2 dispersion curve analysis were employed to evaluate the temperature dependence of the proton exchange rates k(ex). An increase of the energy barrier height Delta G double dagger for the proton chemical exchange between water and ammonium cation (-NH3+) was observed as the DDAC1 concentration was increased. Results are complementary to previous studies of aggregation phenomena for various n-alkylammonium chlorides.
Place, publisher, year, edition, pages
2007. Vol. 111, no 43, 15613-15619 p.
nuclear-magnetic-resonance, relaxation-times, spin-echo, phase-diagrams, nmr-relaxation, water-system, thermodynamics, mechanisms, shift, rates
IdentifiersURN: urn:nbn:se:kth:diva-17079DOI: 10.1021/jp073696sISI: 000250559900016ScopusID: 2-s2.0-36049013673OAI: oai:DiVA.org:kth-17079DiVA: diva2:335122
QC 201005252010-08-052010-08-05Bibliographically approved