عنوان

A study of translational diffusion constants of paramagnetic species in solution

TLpq230732790

انگلیسی

A study of translational diffusion constants of paramagnetic species in solution

[Thesis]

H. B. A. Balkhoyor

King Fahd University of Petroleum and Minerals (Saudi Arabia)

1993

153

M.S.

King Fahd University of Petroleum and Minerals (Saudi Arabia)

1993

The translational diffusion constants of two paramagnetic species, dichlorobis(usd\etausd-cyclopentadienyl)vanadium, abbreviated as (Cp2VCl2) in chloroform, and S-methyl-N-usd5 usd-methoxy-salicylidenehydrazine-carbodithioatophenanthroline-oxovnadium(IV), abbreviated as VO (5-MeO-Sal SB) (Phen) in methylene chloride were measured at room temperature (25 1C) by a capillary diffusion method. The translational diffusion processes were monitored by electron spin resonance spectral intensities as a function of time. The total spectral intensities were plotted as a function of time and from the best least squares fit a single value of the translational diffusion coefficient was obtained. A computer program based on Fick's second law of diffusion for the capillary diffusion cell has been written to get a single value of the diffusion constant. It was found that Cp2VCl2 was undergoing anisotropic reorientation with N = 2.7 0.5 at an axis z = Y. In addition, the rotational correlation times as a function of temperature were determined from the line width data. (Abstract shortened by UMI.)

Chemistry

Pure sciences

H. B. A. Balkhoyor

p

[Thesis]

276903

a

Y