spectroscopy. The absorption spectra are all similar irrespective of substituent and solvent. By comparison the fluorescence is strongly dependent on the electronic character of the substituents. All compounds fluoresce in a low temperature solvent glass and in the solid state and only the 4-cyanophenyl and 4-nitrophenyl derivatives show fluorescence in solution at room temperature. The spectroscopic
通过将一系列电子不同的对位取代
苯胺重氮化,然后将这些重氮盐与4,
5-二氢-5-氧-2-氧-2-芳基(1H)
吡咯-3-
羧酸乙酯进行偶氮偶联,制备十种偶氮
染料。耦合组件。所有
染料均被确认为酮hydr互变异构体,并且被发现为E-和Z-异构体相对于环外C N键的混合物为11 H-NMR光谱。吸收光谱都相似,而与取代基和溶剂无关。相比之下,荧光强烈依赖于取代基的电子特性。所有化合物在低温溶剂
玻璃中以固态发出荧光,只有4-
氰基苯基和4-
硝基苯基衍
生物在室温下显示荧光。用激发后E / Z异构化和荧光之间的竞争来解释光谱行为。