作者:Wilson, Kenneth D.、Styers, William H.、Wood, Samuel A.、Woods, R. Claude、McMahon, Robert J.、Liu, Zhe、Yang, Yang、Garand, Etienne
DOI:10.1021/jacs.4c05043
日期:——
accurate quantification of the singlet–triplet gap presented here allows for direct evaluation of various computational electronic structure methods and highlights the critical importance of the proper description of the double excitation character of these electronic states. Overall, this study validates the idea that despite Hund’s multiplicity rule, useful organic chromophores can have inherently inverted
我们报告了 1,3,4,6,9b-pentaazaphenalene 中反向单重态-三重态间隙的直接、准确的光谱定量。该测量是通过高分辨率低温阴离子光电子能谱直接探测最低单线态和三线态来实现的。第一激发单重态的分配通过 20 K 氩基体中的可见吸收光谱得到证实。我们的测量产生了一个倒置的单重态-三重态能隙,Δ E ST = -0.047(7) eV。这里提出的单线态-三线态间隙的精确量化允许直接评估各种计算电子结构方法,并强调正确描述这些电子态的双激发特性的至关重要性。总体而言,这项研究验证了这样的观点:尽管存在洪德的多重性规则,但有用的有机发色团可能具有固有的倒置单线态-三线态间隙。