Herbich, Jerzy published the artcileDual fluorescence of 4-(dialkylamino)pyrimidines. Twisted intramolecular charge transfer state formation favored by hydrogen bond or by coordination to the metal ion, Quality Control of 31401-45-3, the publication is Journal of Physical Chemistry (1989), 93(9), 3439-44, database is CAplus.
4-(N,N-Dimethylamino)pyrimidine did not exhibit any markedly dual luminescence even in highly polar (aprotic) solvents, unless the ortho substituent deviated the NMe2 group from coplanarity with the ring. Protic solvents or complexation with Zn2+ caused the longwave fluorescence to appear distinctly. 4-(N,N-Diethylamino)pyrimidine revealed dual luminescence in sufficiently polar (aprotic) environment. In alc. solutions the intensity of the fluorescence was reduced. Fluorescence properties of this group of compounds fit the twisted intermol. charge transfer model. The importance of nonradiative deactivation increases with the H+-donating ability of the solvent.
Journal of Physical Chemistry published new progress about 31401-45-3. 31401-45-3 belongs to pyrimidines, auxiliary class Pyrimidine,Amine, name is N,N-Dimethylpyrimidin-4-amine, and the molecular formula is C6H9N3, Quality Control of 31401-45-3.
Referemce:
https://pubchem.ncbi.nlm.nih.gov/compound/Pyrimidine,
Pyrimidine – Wikipedia