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Electronic states of di-t-butylpolyacetylene radical cations

✍ Scribed by Edgar Heilbronner; Taylor B. Jones; Else Kloster-Jensen; John P. Maier

Publisher
John Wiley and Sons
Year
1978
Tongue
German
Weight
368 KB
Volume
61
Category
Article
ISSN
0018-019X

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✦ Synopsis

Abstract

The π‐ionization energies of the di‐t‐butylpolyacetylenes with two, three, four and five conjugated triple bonds have been determined by He (Iα) photoelectron spectroscopy. The assignment of the bands to the Π‐states of the corresponding radical cations follows from simple correlations in agreement with previous experience. The influence of the t‐butyl groups on the ionization energies is rationalized in terms of traditional, qualitative arguments assuming an inductive and/or hyperconjugative mechanism. However, a more careful analysis shows that the ‘The ‐higher‐the‐ionization‐energy‐the‐higher‐the‐alkyl‐induced‐shift’ rule is not always true.

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