Quadruply B←N-Fused Dibenzo-azaacene with High Electron Affinity and High Electron Mobility.

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ID: 60088
2019
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Abstract
For many years, organoboron compounds have been expected to show excellent electron injecting and transporting properties. However, LUMO energy levels (ELUMO) of B-containing π-conjugated molecules are mostly higher than -4.0 eV and their electron mobilities are usually less than 10-2 cm2 V-1 s-1. In this work, we experimentally prove the remarkably high electron affinity and high electron mobility of organoboron compounds. Our strategy is to incorporate multiple boron-nitrogen coordination bonds (B←N) into azaacenes. We synthesized quadruply B←N-fused dibenzo-azaacene (QBNA) through one-pot multifold borylation cyclization reaction. The incorporation of four B←N units greatly changes the electronic structures and properties and significantly downshifts the electronic energy levels of QBNA. QBNA shows a ELUMO of as low as -4.58 eV, which is among the lowest for n-type organic semiconductors. Single-crystal organic field-effect transistors (SC-OFETs) of QBNA display unipolar n-type characteristic with an electron mobility of up to 1.60 cm2 V-1 s-1 together with excellent ambient stability. This study thus provides a design strategy for high-performance n-type organic semiconductors and high electron-affinity π-systems based on organoboron chemistry.
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Authors Yang Min, Chuandong Dou, Dan Liu, Huanli Dong, Jun Liu
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Journal Journal of the American Chemical Society
Year 2019
DOI
10.1021/jacs.9b09640
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Keywords
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