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

Edward M. Kosower*, Jaime R. de Souza

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


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 nπ. The label, nπ-ct→π*, is proposed for these transitions. For the first time, two nπ-ct→π* transitions for a molecule containing a pair of adjacent nitrogens adjacent to a π-acceptor system are reported.

Original languageEnglish
Pages (from-to)3-7
Number of pages5
JournalChemical Physics
Issue number1 SPEC. ISS.
StatePublished - 9 May 2006


FundersFunder number
Helmuth Heineman Foundation


    • Bimanes [syn-bicyclo[3.3.0]octadienediones]
    • Charge-transfer absorptions
    • Charge-transfer emissions
    • Maleimides
    • Solvent effects
    • Two n-ct→π* transitions
    • n-ct→π* transitions


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