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- Title
On Excited States of Alkyl Bridged [14] Annulenes.
- Authors
Spanget-Larsen, Jens; Gleiter, Rolf
- Abstract
The linear dichroic absorption spectrum of 1,3,6,8-trans-15, 16-hexamethyl-dihydropyrene has been measured in stretched polyethylene at 77K, and CNDO-CI calculations with inclusion of singly and doubly excited configurations have been carried out on a series of alkyl bridged [14] annulenes with pyrene- and anthracene-shaped perimeters. Transitions to e3g → e4u type 1B states are well described, and the results indicate that additional low-energy excited states originate from e3g→ e5g and e2u → e4u type configurations interacting strongly with doubly excited configurations of the e3g, e3g → e4u, e4u type. The second excited singlet state responsible for the weak transition observed between the 1L bands may be assigned to one of these additional states, but it is probably of complex nature, similar to the 'phantom' state in linear polyenes.
- Publication
Helvetica Chimica Acta, 1978, Vol 61, Issue 8, p2999
- ISSN
0018-019X
- Publication type
Article
- DOI
10.1002/hlca.19780610825