Exploiting Substituent Effects for the Synthesis of a Photooxidatively Resistant Heptacene Derivative
作者:Irvinder Kaur、Nathan N. Stein、Ryan P. Kopreski、Glen P. Miller
DOI:10.1021/ja808881x
日期:2009.3.18
14, and 18 (i.e., steric resistance on neighboring rings) make heptacene derivative 4 especially resistant to photooxidation. It persists for weeks as a solid, for 1-2 days in solution if shielded from light, and for several hours in solution when directly exposed to both light and air. Heptacene derivative 4 has been fully characterized. It possesses a small HOMO-LUMO gap of 1.37 eV.
已利用取代基效应产生异常持久的七苯衍生物。总共合成了四种具有不同抗光氧化性 (1 < 2 < 3 < 4) 的新型七苯衍生物。7 位和 16 位的对(叔丁基)噻吩取代基(即连接到反应性最强的环上的芳硫基取代基)和 5、9、14 和 18 位的邻二甲基苯基取代基(即对相邻环)使七苯衍生物 4 特别耐光氧化。它以固体形式存在数周,如果避光可在溶液中持续 1-2 天,如果直接暴露在光和空气中,则可在溶液中持续数小时。七苯衍生物 4 已被充分表征。它具有 1.37 eV 的小 HOMO-LUMO 间隙。