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Investigations of the influence of molecular geometry on the spectroscopic and photochemical properties of α-oxo[1.n]paracyclophanes (cyclophanobenzophenones)

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Staab,  Heinz A.
Department of Organic Chemistry, Max Planck Institute for Medical Research, Max Planck Society;

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Alt,  Reinhold
Max Planck Institute for Medical Research, Max Planck Society;

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https://pubs.acs.org/doi/10.1021/ja00198a059
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https://pubs.acs.org/doi/pdf/10.1021/ja00198a059
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Citation

Turro, N. J., Gould, I. R., Liu, J., Jenks, W. S., Staab, H. A., & Alt, R. (1989). Investigations of the influence of molecular geometry on the spectroscopic and photochemical properties of α-oxo[1.n]paracyclophanes (cyclophanobenzophenones). Journal of the American Chemical Society, 111, 6378-6383. doi:10.1021/ja00198a059.


Cite as: https://hdl.handle.net/21.11116/0000-000B-4A5C-C
Abstract
The spectroscopic and photochemical properties of a family of - [ 1.«] paracyclophanes (8-12) for = 8-12, respectively) have been investigated. Compared to a model structure possessing a nominal )( *) state (4,4'-dimethylbenzophenone, DM-BZ), photochemical and photophysical evidence is presented that the * character of T] decreases as the cyclophane ring size decreases. For example, the rate constants for hydrogen atom abstraction from 1,4-cyclohexadiene
in acetonitrile are 1.6 X 10s, 0.93 X 10s, 0.30 X 10s, 0.06 X 108, and 0.04 X 108 M-1 s-1 for triplet 12-8, respectively, a result consistent with decreasing * character and decreasing reactivity toward hydrogen atom abstraction with decreasing value of n. The spectroscopic properties (vibrational structure of the phosphorescence spectrum, phosphorescence lifetime, phosphorescence excitation spectra, triplet-triplet absorption spectra) also vary in a manner consistent with decreasing * character as the cyclophane ring size decreases.