Electron spin resonance and polarization spectra of oxovanadium(IV) porphyrins oriented in stretched PVA films
- 10 October 1984
- journal article
- research article
- Published by Taylor & Francis in Molecular Physics
- Vol. 53 (2) , 369-380
- https://doi.org/10.1080/00268978400102371
Abstract
Polarizations of the electronic transitions in metalloporphyrins were determined by polarized absorption measurements on poly(vinyl alcohol) films dyed with oxovanadium(IV) complexes of tetra(4-sulphophenyl)porphin being stretched in one direction within the plane of the polymer film. The stretching gives rise to a uniaxial orientational distribution of the disclike molecules. The E.S.R. spectra taken with the identical stretched films support the uniaxial distribution. The orientational distribution was determined by comparing the angular dependence of the observed E.S.R. line-shape with that calculated by a computer program developed for the numerical deconvolution of E.S.R. spectra of the partially ordered paramagnetic ensemble. The best fit distribution function was a long tailing function such as lorentzian rather than gaussian and could reasonably reproduce the optical polarization. The E.S.R. parameters of CuTPPS4 were also evaluated by analysis of the complicated spectra of CuTPPS4 observed partially oriented in the stretched PVA film.Keywords
This publication has 14 references indexed in Scilit:
- Polarized absorption and electron spin resonance spectra of tetraphenylporphinatocopper(II) oriented in stretched polymer filmsThe Journal of Physical Chemistry, 1982
- Simple formulas for dichroism analysis. Orientation of solutes in stretched polymer matricesThe Journal of Chemical Physics, 1980
- A critical comparison of methods for analysis of linear dichroism of solutes in stretched polymersThe Journal of Physical Chemistry, 1980
- Orientational distributions in partially ordered solids as determined from NMR and ESR line shapesThe Journal of Chemical Physics, 1978
- Linear dichroism of free base tetraphenyl porphinChemical Physics Letters, 1976
- The linear dichroism spectra of free base and manganese(III) porphyrinsChemical Physics Letters, 1976
- Electron paramagnetic resonance spectra of copper (II) and oxovanadium (IV) complexes oriented in nematic glasses from liquid crystal solventJournal of the American Chemical Society, 1972
- High Sensitivity Linear Dichroism Spectrum of Tetraphenylporphyrin in Stretched Polyethylene.Acta Chemica Scandinavica, 1972
- The Average Orientation of Solute Molecules in Nematic Liquid Crystals by Proton Magnetic Resonance Measurements and Orientation Dependent Intermolecular ForcesMolecular Crystals, 1966
- Dichroism of Dyes in the Stretched PVA Sheet. II. The Relation between the Optical Density Ratio and the Stretch Ratio, and an Attempt to Analyse Relative Directions of Absorption BandsBulletin of the Chemical Society of Japan, 1959