Electron spin echo of a Langmuir-Blodgett film

Romanelli, Marco; Bonosi, Francesca; Chen, Xinhua.; Kevan, Larry

doi:10.1021/la00054a001

Cited by 3 publications

(1 citation statement)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, in a previous work on ESE spectra obtained from Langmuir-Blodgett films built up with a stearic acid/ 5-DXSA10/1 mol/mol mixture, a proton modulation has been observed. 31 The overall spin echo signal V(t) is the product of the functions describing the decay, Vd(t), and the modulation, Vm(t):…”

Section: Resultsmentioning

confidence: 99%

Electron Spin Echo Study of Doxyl Spin Probes in Micellar Systems of Ammonium Perfluorooctanoate

Romanelli¹,

Ristori²,

Martini³

et al. 1994

J. Phys. Chem.

Self Cite

View full text Add to dashboard Cite

The two-pulse and three-pulse electron spin echo techniques were applied to investigate the behavior of doxyl stearic acid spin probes in micellar aqueous solutions of ammonium perfluorooctanoate. Three doxyl stearic acids with the nitroxide group in different positions on the alkyl chain were used as spin probes, and deuteriated water was used to study the deuterium modulation of the echo signals. The experimental patterns were interpreted by best-fit spectra calculated by taking into account both the echo decay and the nuclear modulation. The analysis determines the number of deuterium nuclei in the surroundings of the NO groups and the time constant for the electron spin reorientation causing spectral diffusion and echo decay. From these data we conclude that water molecules belonging to the N O solvation sphere were maintained in the micelles and that the long-chain nitroxide probes were tilted in the micelle core in order to occupy regions with relatively easy water accessibility which was slightly higher for 12-DXSA than for 5-and 16-DXSA. The modulation of the hyperfine couplings of the methyl protons due to their rotational motionwas the main mechanism contributing to the echo decay.

show abstract

Section: Resultsmentioning

confidence: 99%