首页|A C54B2 Polycyclic π-System with Bilayer Assembly and Multi-Redox Activity
A C54B2 Polycyclic π-System with Bilayer Assembly and Multi-Redox Activity
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Doping heteroatoms into polycyclic aromatic hydro-carbons(PAHs)is an efficient strategy to achieve fascinating electronic structures and materials.How-ever,nanoscale B-doped PAHs remain very challeng-ing because of the intrinsic instability of the boron atom and the lack of suitable precursors.In this study,we report a C54B2 polycyclic π-system with one em-bedded 1,4-diboron-substituted benzene subunit,which was successfully synthesized from doubly B-doped heptazethrene.This molecule represents not only the largest B-doped PAH by far but also an unprecedented B-doped nanographene.The fully zig-zag-armchair-edged structure creates a planar con-formation,thus leading to its unique bilayer assembly behavior.More importantly,it possesses intriguing electronic structure and optoelectronic properties,such as very broad light absorption that covers 350-750 nm,sharp near-infrared fluorescence with a band width of only 26 nm,and reversible five-step redox capability,all of which are rarely observed for other B-doped PAHs.In addition,this molecule dis-plays distinctive local aromaticity that cannot be reproduced via the reductive manipulation of an all-carbon congener.
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