Nucleosides 8 [18]: Ribosylation of Fused Quinazolines—Synthesis of New [1,2,4]Triazolo[5,1-b]- and [1,2,4]Triazino[3,2-b]quinazoline Nucleosides of Fluorescence Interest

Table 1

Optical properties of the products 2, 5, 7, 11, 15, 16, 17, 19, and 20.

Compound no.	2	5	7	11	15	16	17	19	20
λ max  abs. (nm)	318	325	330	342	318	298	286	368	328
λ max  em. (nm)	388	376	374	379	390	331	335	382	376
Bandgap (ev)	3.9	3.81	3.76	3.63	3.9	4.17	4.34	3.37	3.78