ELECTRON SPIN RESONANCE STUDIES OF A WEAKLY COUPLED BIRADICAL

Abstract

ELECTRON SPIN RESONANCE, INCLUDING ITS TEMPERATURE DEPENDENCE, HAS BEEN STUDIED IN SEVERAL SOLID SALTS DERIVED FROM ALPHA,ALPHA,BETA,BETATETRAKIS-(4-DIMETHYLAMINOPHENYL)-ETHYLENE(I). THE PARAMAGNETISM APPEARS TO RESULT FROM THERMAL EXCITATION TO LOW LYING TRIPLET ELECTRONIC STATES IN WHICH THE UNPAIRED ELECTRONS ARE ONLY WEAKLY COUPLED. EXCITATION ENERGIES OF 4.5 AND 8.6 KCAL/MOLE ARE FOUND FOR THE I-DIIODIDE AND THE I-DINITRATE, RESPECTIVELY. IT IS SUGGESTED THAT THE AVERAGING OUT OF HYPERFINE AND ELECTRON DIPOLE-DIPOLE SPLITTINGS RESULTS FROM DELOCALIZATION OF THE UNPAIRED ELECTRONS AND FROM EXCHANGE INTERACTIONS WHICH MAY BE AIDED BY THE DIFFUSION OF THE PARAMAGNETIC SPECIES WHICH RESULTS FROM THE THERMAL EXCITATION AND DEACTIVATION

Document Details

Document Type
Technical Report
Publication Date
Nov 29, 1960
Accession Number
AD0250680

Entities

People

  • D.h. Anderson
  • Herbert S. Gutowsky
  • R.b. Sandin

Organizations

  • University of Illinois Urbana–Champaign

Tags

DTIC Thesaurus Topics

  • Alkenes
  • Electron Spin Resonance
  • Electronic States
  • Electrons
  • Ethylenes
  • Excitation
  • Magnetic Resonance
  • Paramagnetism
  • Resonance
  • Spin Resonance

Fields of Study

  • Chemistry
  • Physics

Readers

  • Organic Chemistry
  • Quantum spin resonance or Electron Paramagnetic Resonance spectroscopy.

Technology Areas

  • Microelectronics