3,5,7,9-Substituted Hexaazaacridines: Toward Structures with Nearly Degenerate Singlet−Triplet Energy Separations
作者:Peter Langer、Shadi Amiri、Anja Bodtke、Nehad N. R. Saleh、Klaus Weisz、Helmar Görls、Peter R. Schreiner
DOI:10.1021/jo8005123
日期:2008.7.1
9-hexaazaanthracene derivatives. The effects of substitution on the molecular electronic properties were probed both experimentally and computationally [B3LYP/6-311G(d,p)//B3LYP/6-31G(d,p)]. While the experimentally prepared structures already have small (20−25 kcal/mol) singlet−triplet energy gaps, systems with even smaller (<9 kcal/mol) singlet−triplet energy separations can be realized through systematic
为了准备稳定的中性开壳系统,我们合成了一系列新的p-苯基取代的3,5,7,9-六氮杂cr啶和3,5,7,9-六氮杂蒽衍生物。通过实验和计算[B3LYP / 6-311G(d,p)// B3LYP / 6-31G(d,p)]探讨了取代对分子电子性能的影响。尽管实验制备的结构已经具有较小的(20-25 kcal / mol)单重态-三重态能隙,但可以通过取代基数目,类型的系统变化实现具有更小的(<9 kcal / mol)单重态-三重态能级分离的系统和样式。与六氮杂cr啶相比,六氮杂蒽具有更小的单线态-三重态能隙。氮键引起的正感应和介晶效应的σ和π受体取代基以及碳键合的σ供体取代基使取代的六氮杂蒽成为纯有机高自旋体系的有希望的候选者。