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Deuterium isotope effects on the zero-field splittings of the lowest triplet state of benzaldehyde derivatives

✍ Scribed by S.M. Neugebauer; D.S. Tinti

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 334 KB
Volume: 211
Category: Article
ISSN: 0009-2614
DOI: 10.1016/0009-2614(93)80142-c

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✦ Synopsis

The zero-field splitting parameters, D and E, in the lowest triplet state of pchlorobenzaldehyde, pmethylbenzaldehyde, and their d, isotopes (aldehyde proton), are determined by ODMR measurements. The results show that the sign of the isotopic change in D reflects the orbital character of the lowest triplet state. The magnitude of D increases in the d, isotope of both guests inp-dimethoxybenzene where the lowest guest triplet state is %nt*, but it decreases inpxylene where the state is ?ot'. The results are interpreted m terms of the spin-orbit interacttons between the nearby %rrc and 'I& states and the isotopic changes in the zero-point energies of the states.

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