Five new, constrained, aryl-substituted 4,4-difluoro-4-bora-3a,4a-diaza-s-indacene (BODIPY) dyes (3f,g and 4h-j) were prepared and investigated to see if they have more favorable fluorescence characteristics than the unconstrained systems 2 that were prepared in previous studies. Dye types 3 and 4 have relatively rigid conformations caused by the heteroatom (3f and 3g) or ethylene bridge (4h-j) linkers that preclude free rotation of the substituted-benzene molecular fragments. In the event, the new dye types 3 and 4 have longer lambda(max) (abs) (620-660 nm) and lambda(max) (fluor) (630-680 nm) values than compounds 2, They also exhibit higher extinction coefficients (>100 000 M (1) cm(-1) except for 3g). Their fluorescent quantum yields are high (up to 0.72 for 4j), with the exception of compound 3g, which has a quantum yield of only 0.05. The redox properties of dyes 3 and 4 have also been examined.
KRUTOSIKOVA, A.;KOVAC, J.;DANDAROVA, M.;BOBALOVA, M., COLLECT. CZECH. CHEM. COMMUN., 1982, 47, N 12, 3288-3296
作者:KRUTOSIKOVA, A.、KOVAC, J.、DANDAROVA, M.、BOBALOVA, M.