Synthesis and pH-Dependent Spectroscopic Behavior of 2,4,6-Trisubstituted Pyridine Derivatives
作者:Gala Chapman、Isaac Solomon、Gabor Patonay、Maged Henary
DOI:10.1002/jhet.1923
日期:2015.5
diethylamino nitrogen atom. Protonation of the pyridine ring nitrogen is associated with the appearance of a red‐shifted intramolecular charge transfer peak in the UV‐visible spectra. Favorable color indicating properties result from electron‐donating substitution at the 2 and 6 positions of pyridine, which provide a greater absorptivity of the red‐shifted peak associated with protonation of the pyridine nitrogen
合成了7个在4位具有N,N-二乙基苯胺取代基的2,4,6-三取代吡啶衍生物,并研究了它们在不存在和存在酸的情况下的光谱性质。质子化的光谱效应,摩尔吸收率,p K a确定值,并观察到的光谱行为的结构起源。发现吡啶氮比二乙氨基氮原子更具碱性。吡啶环氮的质子化与紫外可见光谱中出现红移的分子内电荷转移峰有关。良好的颜色指示特性是由于吡啶的2和6位上的给电子取代引起的,这提供了与吡啶氮质子化相关的红移峰的更大吸收性。这些发现将有助于为离子指示和pH传感应用设计和优化这些化合物。