Smagowicz, J. published the artcileThe phosphorescence of hindered aminopyrimidines, Application of N,N-Dimethylpyrimidin-4-amine, the publication is Journal of Luminescence (1976), 14(1), 9-18, database is CAplus.
The quantum yields, lifetimes, and polarizations of phosphorescence of 4- and 5-aminopyrimidines and their hindered alkyl derivatives were measured in solvents of different polarity at 90°K. The model presented for interpretation of these data allows determining the matrix elements of spin-orbit coupling between the emitting singlet and triplet states. These elements are 0.2-0.8 cm-1 in aminopyrimidines and increase as the amino group becomes more twisted relative to the ring. Spin-orbit coupling of higher 1(n,π*) states with emitting triplets is ∼10 times stronger than that of the lowest 1(l,aπ*).
Journal of Luminescence 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 C22H18Cl2N2, Application of N,N-Dimethylpyrimidin-4-amine.
Referemce:
https://pubchem.ncbi.nlm.nih.gov/compound/Pyrimidine,
Pyrimidine – Wikipedia