Altalbawy Farag, Darwish Elham, Medhat Mohamed, El-Zaiat Sayed, Saleh Hagar
Department of Measurements and Environmental Applications, National Institute of Laser Enhanced Sciences (NILES), Cairo University, Giza 12613, Egypt.
Department of Chemistry, University College of Duba, Tabuk University, Duba 71911, Saudi Arabia.
Materials (Basel). 2016 Dec 19;9(12):1022. doi: 10.3390/ma9121022.
A novel series of the title compound 4-(5-arylazo-2-hydroxystyryl)-1-methylpyridinium iodide has been synthesized via condensation reactions of the arylazosalicylaldehyde derivatives - with 1-methyl-picolinium iodide . The structures of the new arylazo compounds were characterized by ¹H NMR, IR, mass spectroscopy, as well as spectral and elemental analyses. The electronic absorption spectra of arylazomerocyanine compounds were measured in different buffer solutions and solvents. The pK's and pK*'s in both the ground and excited states, respectively, were determined for the series and their correlations with the Hammett equation were examined. The results indicated that the title arylazomerocyanine dyes exist in the azo form in both ground and excited states. The substituent and solvent effects (solvatochromism) of the title compound arylazomerocyanine dyes were determined using the Kamlet-Taft equation and subsequently discussed.
通过芳基偶氮水杨醛衍生物与碘化1-甲基吡啶鎓的缩合反应，合成了一系列新型标题化合物4-(5-芳基偶氮-2-羟基苯乙烯基)-1-甲基吡啶鎓碘化物。通过¹H NMR、红外光谱、质谱以及光谱和元素分析对新型芳基偶氮化合物的结构进行了表征。在不同的缓冲溶液和溶剂中测量了芳基偶氮甲川菁化合物的电子吸收光谱。分别测定了该系列化合物在基态和激发态下的pK值和pK*值，并研究了它们与哈米特方程的相关性。结果表明，标题芳基偶氮甲川菁染料在基态和激发态均以偶氮形式存在。使用Kamlet-Taft方程确定了标题化合物芳基偶氮甲川菁染料的取代基和溶剂效应（溶剂化显色），并随后进行了讨论。
