9-Aminofluorenium Cations: A New Group of anti-Aromatic Molecules

Quantum-chemical and spectral studies on the protonated form of fluorenone-anil show that this compound has anti-aromatic character. Its real structure should be considered as: 9-amino derivative of the anti-aromatic fluorenium cation.

Photophysical and Photochemical Properties of 2,3-Dihydro-4(l H)-quinolinones. Part I. Fluorescence Properties

Absorption spectra and fluorescence properties of 2,3-dihydro-4(1 H)-quinolinone derivatives were studied at room temperature in different solvents. It has been found that the fluorescence quantum yields and fluorescence decay times strongly depend on the molecular structure and solvent polarity. The character and the energy of excited states were determined by PPP and CNDO/S quantum-chemical calculations.