Additional Insights into Luminescence Process of Polycyclic Aromatic Hydrocarbons with Carbonyl Groups: Photophysical Properties of Secondary <i>N</i>-Alkyl and Tertiary <i>N</i>,<i>N</i>-Dialkyl Carboxamides of Naphthalene, Anthracene, and Pyrene
作者:Yosuke Niko、Yuki Hiroshige、Susumu Kawauchi、Gen-ichi Konishi
DOI:10.1021/jo300317r
日期:2012.4.20
substitution effects of N-alkyl and N,N-dialkyl carboxamide groups on the fluorescence properties of polycyclic aromatic hydrocarbon chromophores, so as to control their fluorescence properties. The fluorescence properties of compounds obtained using solvents with different polarities showed very little change, indicating that the modified compounds do not form charge transfer states. TD-DFT calculations and
在这里,我们报道了N-烷基和N,N-二烷基羧酰胺基团对多环芳烃发色团的荧光性质的取代作用,从而控制了它们的荧光性质。使用具有不同极性的溶剂获得的化合物的荧光性质几乎没有变化,表明改性的化合物没有形成电荷转移态。在低温(78 K)和粘性溶剂中进行的TD-DFT计算和测量表明,N-烷基和N,N-二烷基羧酰胺基团倾向于减少来自系统间交叉的贡献并增加来自内部转化的贡献。考虑到醛和酮等低荧光羰基化合物的荧光机理是通过体系间交叉控制的,而羧酸和酯等高发光羰基化合物的荧光机理是通过辐射过程控制的,可以说是光物理过程。的ñ -烷基和ñ,ñ二烷基甲酰胺是新颖的。另外,对于激发态的计算结果表明,除了溶剂粘度和温度以外,还可以通过选择合适的多环芳族烃或酰胺结构来控制这种作用。