n π- ct-π Transitions: nπ Transitions of the second kind

Two important classes of molecules, maleimides and syn-bimanes [ syn-bicyclo[3.3.0]octadienediones], are shown to exhibit charge-transfer absorptions and emissions, mainly on the basis of solvent effects on emissions. The electronic excitation originates mainly in a “non-bonding” p-orbital substanti...

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Bibliographic Details
Published in:Chemical physics 2006-05, Vol.324 (1), p.3-7
Main Authors: Kosower, Edward M., de Souza, Jaime R.
Format: Article
Language:English
Subjects:
Bimanes [ syn-bicyclo[3.3.0]octadienediones]
Charge-transfer absorptions
Charge-transfer emissions
Maleimides
n π- ct→π transitions
Solvent effects
Two n π- ct→π transitions
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Summary:Two important classes of molecules, maleimides and syn-bimanes [ syn-bicyclo[3.3.0]octadienediones], are shown to exhibit charge-transfer absorptions and emissions, mainly on the basis of solvent effects on emissions. The electronic excitation originates mainly in a “non-bonding” p-orbital substantially localized on N, and oriented parallel to the π-system, hence n π. The label, n π- ct→π*, is proposed for these transitions. For the first time, two n π- ct→π* transitions for a molecule containing a pair of adjacent nitrogens adjacent to a π-acceptor system are reported.
ISSN:0301-0104
DOI:10.1016/j.chemphys.2005.08.067