Stable 2D anti-ferromagnetically coupled fluorenyl radical dendrons

Chemical Science
Jian WangJishan Wu

Abstract

We report the first class of stable, two-dimensional (2D) anti-ferromagnetically coupled dendritic polyradicaloids. A kinetically blocked fluorenyl radical was used to build up the first and second generation dendrons FR-G1 and FR-G2 containing three and seven fluorenyl units, respectively. The neighboring fluorenyl radicals in FR-G1 and FR-G2 show moderate anti-ferromagnetic exchange interaction, resulting in a doublet and quartet ground state, respectively, with a small doublet-quartet energy gap. From FR-G1 to FR-G2, the energy gap decreased and the two-photon absorption was enhanced owing to more extended 2D π-conjugation. Both compounds showed multiple redox waves due to their polyradical character.

References

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Mar 28, 2007·Angewandte Chemie·Kenji KamadaMasayoshi Nakano
Oct 24, 2009·Physical Chemistry Chemical Physics : PCCP·David Casanova, Martin Head-Gordon
Aug 23, 2012·Journal of the American Chemical Society·Yuan LiJishan Wu
Dec 12, 2012·Organic Letters·Hao-Chun TingChung-Chih Wu
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Aug 26, 2017·Journal of the American Chemical Society·Xuefeng LuJishan Wu
Feb 10, 2018·Chemical Communications : Chem Comm·Tullimilli Y GopalakrishnaJishan Wu

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Methods Mentioned

BETA
AFM
column chromatography
ESR

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