Investigation of the excited triplet states of [2.2]- and [3.3]paracyclophane

Melzer, Günter; Schweitzer, Dieter; Hausser, Karl H.; Colpa, J. P.; Haenel, M. W.

doi:10.1016/0301-0104(79)87010-X

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Investigation of the excited triplet states of [2.2]- and [3.3]paracyclophane

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Melzer, Günter
Max Planck Institute for Medical Research, Max Planck Society;

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Schweitzer, Dieter
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;

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Hausser, Karl H.
Department of Molecular Physics, Max Planck Institute for Medical Research, Max Planck Society;

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Citation

Melzer, G., Schweitzer, D., Hausser, K. H., Colpa, J. P., & Haenel, M. W. (1979). Investigation of the excited triplet states of [2.2]- and [3.3]paracyclophane. Chemical Physics, 39(2), 229-235. doi:10.1016/0301-0104(79)87010-X.

Cite as: https://hdl.handle.net/21.11116/0000-0004-5940-0

Abstract

We have studied the excited triplet states of [2-2]- and [3.3]paracyclophane by emission spectroscopy and by ODMR and have compared the results with the corresponding monomer paraxylene. The most striking result is that both phanes exhibit two sets of zero field splitting parameters indicating the existence of two nearly degenerate low lying excited triplet states. Furthermore, we find in distinction to expection a stronger reduction of the zero field splitting parameters as compared to the monomers for [3.3]paracyclophane than for [2.2] paracyclophane. The causes of these surprising experimental findings are discussed.