Abstract
AbstractThree new multipolar chromophores based on ladder‐type units (fluorene, indenofluorene, and bisindenofluorene) as the central π‐bridges and with functionalized pyrazine moieties fused at the molecular terminal positions have been designed and synthesized in order to serve as a set of model compounds for the study of possible effects on the molecular two‐photon absorption (2PA) properties that might be introducible by the structural arrangement. Preliminary experimental results showed that these model dye molecules display broad and intense 2PA in the near‐IR region. Tentative analysis of the relationship between structure and 2PA revealed that the π‐conjugation length of the central oligo‐p‐phenylene component is closely related to the magnitude of overall molecular 2PA and that such a structural motif provides access to highly efficient nonlinear absorbers.
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