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Die Electronenzustände von Perimeter‐π‐Systemen: III. Das Elektronenspektrum des 1,6‐Methano‐[11] annulenium‐Kations
Author(s) -
Grimme W.,
Heilbronner E.,
Hohlneicher G.,
Vogel E.,
Weber J. P.
Publication year - 1968
Publication title -
helvetica chimica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.74
H-Index - 82
eISSN - 1522-2675
pISSN - 0018-019X
DOI - 10.1002/hlca.19680510128
Subject(s) - chemistry , excited state , methylene , crystallography , extended hückel method , stereochemistry , molecular orbital , atomic physics , medicinal chemistry , physics , molecule , organic chemistry
The electronic spectra and the polarisation of the transitions have been determined for the 1,6‐methano‐[11] annulenium cation III and the 4,6‐dimethyl‐1,2‐benzotropylium cation IV. The observed sequence of polarisation of the prominent bands corresponding to the lowest electronically excited states is in agreement with the predictions derived from molecular orbital models of the P ARISER ‐P ARR ‐P OPLE type. The influence of partial conjugation between the bridged centre and of the inductive effect of the methylene group in III has been investigated.