Near-Infrared Absorbing Compounds Based on π‑Extended Tetrathiafulvalene Open-Cage Fullerenes

Tetrathiafulvalene (TTF) is attached to open-cage fullerenes through a quinoxaline junction. The resulting linear π-conjugation system shows intense absorption in the near-infrared region. A unique o-diaminobenzene-induced furan ring formation process from a conjugated 1,4-dione moiety was observed on the rim of a 18-membered orifice.四硫富瓦烯（Tetrathiafulvalene，TTF）通过喹喔啉连接基（quinoxaline junction）与开笼富勒烯（open-cage fullerenes）相连。所得到的线性π共轭体系（linear π-conjugation system）在近红外区域（near-infrared region）展现出强烈的吸收特性。在18元孔口（18-membered orifice）的边缘处，观测到一种独特的、由邻苯二胺（o-diaminobenzene）诱导的、源自共轭1,4-二酮基团（conjugated 1,4-dione moiety）的呋喃环形成过程。