Mi. Knyazhansky et al., THE SEARCH AND INVESTIGATION OF THE NOVEL PHOTO-THERMOCHROMIC AND LUMINESCENT FLEXIBLE STRUCTURES WITH INTRAMOLECULAR PROTON-TRANSFER, Molecular crystals and liquid crystals science and technology. Section A, Molecular crystals and liquid crystals, 297, 1997, pp. 391-396
Comparative findings of the experimental and quantum-chemical studies
of the structures including Intramolecular H-Bond ((OHN)-N-... or (NHN
)-N-...) with the endocyclic (A) and exocyclic (B) nitrogen atom have
been obtained. The photochromic properties are shown only in the struc
tures of B-type favorable for the diabatic formation of the metastable
photocolored structure. The molecules of the A-type reveal the thermo
chromism and/or fluorescence with the Anomalous Stokes Shift.