Tetrahedron

Fluorene as the π–spacer for new two-photon absorption chromophores

JZ Cheng, CC Lin, PT Chou, A Chaskar, KT Wong

Index: Cheng, Jian-Zhang; Lin, Chao-Chen; Chou, Pi-Tai; Chaskar, Atul; Wong, Ken-Tsung Tetrahedron, 2011 , vol. 67, # 4 p. 734 - 739

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Citation Number: 23

Abstract

We report herein the design and synthesis of two new quadrupolar D–π–A–π–D chromophores containing diphenyl amine and dicyanobenzene or 2, 1, 3-benzothiadiazole as electron donor (D) and acceptor (A), respectively, which are bridged by fluorene linkage (π). The introduction of coplanar fluorenes is highly beneficial for the enhancement of two- photon absorption (TPA), where 1b displays a TPA cross section (σ2) of up to 1975±207 ...