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Updated: Jun 15, 2025

Single Molecule Fluorescence Microscopy on Planar Supported Bilayers
Published on: October 31, 2015
Two-Photon-Excited Fluorescent Tetrabranched Triphenylborane Featuring the Cooperative Effect of Branching in
Min Wang1, Fang-Kun Wang1, Zhi-Qiang Liu2
1School of Chemistry and Chemical Engineering, Shandong University, Shanda Nanlu 27, Jinan 250100, P. R. China.
Abstract:
We here disclose a new type of two-photon-excited fluorescent triarylborane, tetrabranched triphenylborane 1, which contains four electron-donating [4-(N,N-diphenylamino)phenyl]ethynyl branches at 2,6-positions of two phenyl rings. The cross section of 1 reaches 275 GM (1 GM = 10-50 cm4 s photon-1) in tetrahydrofuran. Compared with dibranched triphenylborane 2, the 2-fold increase in the number of electron-donating branches induces a 3.6-fold increase in the two-photon absorption cross section, suggesting the great cooperative effect of branching in the enhancement of two-photon absorption.
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