Air- and Heat-Stable Planar Tri-<i>p</i>-quinodimethane with Distinct Biradical Characteristics
作者:Xiaozhang Zhu、Hayato Tsuji、Koji Nakabayashi、Shin-ichi Ohkoshi、Eiichi Nakamura
DOI:10.1021/ja206060n
日期:2011.10.19
A heptacyclic carbocycle possessing three p-quinodimethane units conjugated in one plane has been synthesized and shown to exhibit distinct biradical characteristics. The molecule has a HOMO/LUMO band gap of ca. 1 eV and a S(0)-T(1) energy gap of 2.12 kcal/mol, and it absorbs and emits near-IR light at room temperature. It is air-stable under ambient light for several months and thermally stable up to 160 degrees C under nitrogen, and it undergoes reversible two-electron oxidation and reduction. The synthetic approach is such that a smaller and larger oligo-p-quinodimethane can be synthesized.