Comprehensive Studies on Dual Excitation Behavior of Double Proton versus Charge Transfer in 4-(<i>N</i>-Substituted amino)-1H-pyrrolo[2,3-<i>b</i>]pyridines
作者:Chung-Chih Cheng、Chen-Pin Chang、Wei-Shan Yu、Fa-Tsai Hung、Yun-I Liu、Guo-Ray Wu、Pi-Tai Chou
DOI:10.1021/jp021243b
日期:2003.3.1
on the dual excitation behavior of proton vs charge transfer for 4-(dimethylamino)-1H-pyrrolo[2,3-b]pyridine (DPP) and its related derivatives are reported. In cyclohexane, DPP dimer and/or dual hydrogen-bonded complex are formed with association constants Ka as high as ∼4.2 × 103 and 5.2 × 104 M-1 (e.g., the DPP/acetic acid complex) at 298 K, respectively, which upon electronic excitation undergo
报道了 4-(二甲基氨基)-1H-吡咯并[2,3-b]吡啶 (DPP) 及其相关衍生物的质子与电荷转移的双重激发行为的综合光谱和动力学研究。在环己烷中,DPP 二聚体和/或双氢键络合物在 298 K 下形成,缔合常数 Ka 分别高达 ∼4.2 × 103 和 5.2 × 104 M-1(例如,DPP/乙酸络合物),这在电子激发下,经历超快速率(≫6.7 × 1010 s-1)的双质子转移,产生独特的互变异构体发射。在极性非质子溶剂中观察到双荧光,其中大的斯托克斯位移发射带源自分别结合二甲胺和吡啶环作为电子供体和受体的电荷转移物质。