Difluoroboradiazaindacene dye of formula (1) ** ** Formula with R1 = phenyl radical substituted by fluorine C6HmFn with n = 1 to 5 and m + n = 5; or naphthyl radical substituted by fluorine C10HmFn with n = 1 to 9 and m + n = 9; R2 = CH3, C2H5, C3H7 or C4H9; R3 = alkyl, aryl or vinyl aryl; R4, R5 = H, F or CH = CH-CH = CH R4 and R5 bridging moiety; R6, R7 = H, F or CH = CH-CH = CH R6 and R7 bridging moiety; and R8 = alkyl or aryl.
展开▼
