Kinetically Blocked Stable Heptazethrene and Octazethrene: Closed-Shell or Open-Shell in the Ground State?
作者:Yuan Li、Wee-Kuan Heng、Byung Sun Lee、Naoki Aratani、José L. Zafra、Nina Bao、Richmond Lee、Young Mo Sung、Zhe Sun、Kuo-Wei Huang、Richard D. Webster、Juan T. López Navarrete、Dongho Kim、Atsuhiro Osuka、Juan Casado、Jun Ding、Jishan Wu
DOI:10.1021/ja304618v
日期:2012.9.12
demonstrated that the heptazethrene derivative HZ-TIPS has a closed-shell ground state while its octazethrene analogue OZ-TIPS with a smaller energy gap exists as an open-shell singletbiradical with a large measured biradicalcharacter (y = 0.56). Large two-photon absorption (TPA) cross sections (σ((2))) were determined for HZ-TIPS (σ((2))(max) = 920 GM at 1250 nm) and OZ-TIPS (σ((2))(max) = 1200 GM at 1250