Acetetracenylene-1,2-dione was synthesized by double Friedel–Crafts acylation of tetracene with oxalyl chloride in 46–54% yield. Photophysical, electrochemical, and thermal analysis of the compound revealed its band gap (Eg = 1.77 eV for the solid state), electron-accepting nature (Epcred = −1.35 V vs. Fc/Fc+), and thermal stability (Tdecomp > 300 °C). Single crystals were successfully grown by physical vapor transport, and parallel π-stacking of the molecules was observed by X-ray crystallography.
乙炔-1,2-二酮是通过草酰氯与四蒽的双弗里德尔-卡夫酰化反应合成的,收率为 46-54%。该化合物的光物理、电化学和热分析表明了其带隙(固态 Eg = 1.77 eV)、电子接受性(Epcred = -1.35 V vs. Fc/Fc+)和热稳定性(Tdecomp > 300 °C)。通过物理气相传输成功地生长出了单晶体,并通过 X 射线晶体学观察到了分子的平行 π 堆积。
Reduced Knoevenagel Reaction of Acetetracenylene-1,2-dione with Acceptor Units for Luminescent Tetracene Derivatives
Acetetracenylene-1,2-dione reacted with 3-ethylrhodanine in the presence of piperidine and Hantzsch ester via a Knoevenagel-condensation reduction sequence to give a tetracene-rhodanine adduct. This reduced Knoevenagel product exhibited magenta luminescence with a fluorescence quantum yield of phi = 0.34 and fluorescence lifetime of tau = 13.2 ns in toluene. Electrochemical studies and charge carrier transport measurements revealed ambipolar properties with hole and electron mobilities of 5.1 x 10(-7) and 1.6 x 10(-4) cm(2)/(V s), respectively.