Abstract
The spectra 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 us to determine 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 about 10 times stronger than that of the lowest 1( l , a π ∗ ).
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