Determination of very rapid molecular rotation by using the central electron paramagnetic resonance line.

ABSTRACT: Picosecond rotational correlation times of perdeuterated tempone (PDT) are found in alkane and aromatic liquids by directly using the spectral width of the central electron paramagnetic resonance line. This is done by mathematically eliminating the nonsecular spectral density from the spectral parameter equations, thereby removing the need to assume a particular form for it. This is preferable to fitting a constant correction factor to the spectral density, because such a factor does not fit well in the low picosecond range. The electron-nuclear spin dipolar interaction between the probe and solvent is shown to be negligible for the very rapid rotation of PDT in these liquids at the temperatures of the study. The rotational correlation times obtained with the proposed method generally agre

SUBMITTER: Kurban MR 

PROVIDER: S-EPMC3978113 | biostudies-literature | 2013 Feb

REPOSITORIES: biostudies-literature