作者:Cheng Zhang、Samara Medina Rivero、Wuyue Liu、David Casanova、Xiaozhang Zhu、Juan Casado
DOI:10.1002/anie.201904153
日期:2019.8.12
A tetracyano quinoidal tetrathiophene, having a central bi(thieno[3,4‐c]pyrrole‐4,6‐dione) acceptor, has been studied. The recovered aromaticity of the thiophenes produces a diradical species with cross‐conjugation between the inter‐dicyano and inter‐dione acceptor paths. A diradical character of y0=0.61 and a singlet–triplet gap of −2.76 kcal mol−1 were determined. Competition between the two cross‐conjugated
具有中央双(thieno [3,4-c]吡咯-4,6-dione)受体的四氰基喹啉四噻吩已被研究。噻吩的恢复芳香性产生双自由基物种,其在二氰基间和二酮间受体路径之间发生交叉共轭。确定了y 0 = 0.61的双基特征和-2.76 kcal mol -1的单重态-三重态间隙。两种交叉共轭路径之间的竞争增强了SOMO的脱节特性,并导致双自由基限制在分子中心,从而实现了热力学双自由基稳定化(半衰期为262小时)。阴离子物种(直至自由基三阴离子)也解决了交叉共轭效应。