Heterotriangulenes π‑Expanded at Bridging
Positions
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Abstract
A series of nitrogen-containing heterotriangulenes
expanded at
the bridging positions has been synthesized. Among them, a dibenzo[<i>c,g</i>]fluorenylidene-substituted derivative has a highly twisted
conformation for the overcrowded alkene moieties, which impart a highly
electron-accepting character to the electron-donating heterotriangulene
skeleton and thereby an NIR absorption as well as multiredox properties
with a low reduction potential