Quantum-chemical study of electronic properties of model spirooxazines

Victor M. Anisimov, Sergei M. Aldoshin

Research output: Contribution to journalArticlepeer-review


Model spirooxazines were studied via ab initio quantum-chemical calculations. An anomeric interaction between nitrogen lone pair and antibonding orbital of the Cspiro-O bond has been considered by Hartree-Fock SCF level of theory with 3-21G basis set. The extent of the nN-σ*CO interaction has been shown to depend on planarity of the nitrogen atom, being maximized with its planarity growth. Electronic properties and geometry parameters of model spirooxazines were considered by limited CI under 3-21G basis set. Excitation lengthens the Cspiro-O bond and causes a significant polarization of total wave function, which results in increasing of the system dipole moment and transferring the electronic density from the O2 atom and the phenyl fragment onto the N13=C14 bond in the case of spirooxazine and onto the NO2 group in the case of nitro-spirooxazine. Elongation of the C-O bond under excitation is due to the NO2 interaction in spirooxazines. CI calculation of the excited singlet state of a model chromene does not show elongation of this bond.

Original languageEnglish (US)
Pages (from-to)77-84
Number of pages8
JournalJournal of Molecular Structure: THEOCHEM
Issue number1-3
StatePublished - Dec 8 1997
Externally publishedYes


  • Ab initio
  • Anomeric interaction
  • Electronic properties
  • Excited state
  • Model spirooxazines
  • Spirooxazine

ASJC Scopus subject areas

  • Biochemistry
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry


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