Abstract
Two-photon absorption (TPA) properties of several novel donor–acceptor–donor (D–A–D) quadrupolar and octupolar star-shaped molecules containing peripheral diarylthienylamines were investigated and are discussed in this Letter. The effects of donor–acceptor strength, conjugation length, and molecular symmetry on the effective TPA cross-section of these novel molecules were studied. It was found that incorporation of a triazine acceptor center in octupolar molecules can effectively enhance TPA response. This provides a strategy for designing novel octupolar molecules with a large TPA response but without red-shifting their linear absorption wavelengths.
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