The non-coplanar substituted phenyl rings at the 9-position of a fluorenyl unit can be involved in π-electron delocalization in which the resulting oligofluorenes exhibit a very large enhancement of two-photon absorption cross sections up to 2559 GM at 710 nm.
芴基单元 9 位上的非共面取代苯基环可能参与了 π 电子析出,由此产生的低聚
芴在 710 纳米波长下的双光子吸收截面有非常大的提高,最高可达 2559 GM。