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ESR spectroscopic investigations of an organic radical having a quartet ground state

✍ Scribed by G. Kothe; J. Brickmann; H. Zimmermann

Publisher: Elsevier Science
Year: 1973
Weight: 330 KB
Volume: 5
Category: Article
ISSN: 0001-8716
DOI: 10.1016/0001-8716(73)80044-6

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✦ Synopsis

ESR spectroscopic investigations on the three-spin system (1) have been carried out. The radical (1) has a quartet ground state and associates to form a diamagnetic dimer. The association constant K263 = (6.7 + 0.3) x 10 3 l/mole was determined by susceptibility measurements, using ESR spectroscopy. From the temperature dependence of K, a standard enthalpy of association of AH ° = 0 was obtained. Thus, the dimerisation occurs only as a result of an increase in entropy. The low-temperature ESR spectrum of (1) was interpreted with a quantummechanical model. The zero-field parameter D' = 44.1 G was determined by simulation of the experimental spectrum.

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