Experimental and Theoretical Investigations of Spectral, Tautomerism and Acid-Base Properties of Schiff Bases Derived from Some Amino Acids
作者:Y.H. Ebead、H.M.A. Salman、M.A. Abdellah
DOI:10.5012/bkcs.2010.31.04.850
日期:2010.4.20
The electronic absorption spectra of five Schiff bases derived from 2-hydroxy-1-naphthaldehyde with glycine, alanine, leucine, valine and phenylalanine have been measured in various solvents. The observed bands were assigned to the proper electronic transitions and compared with the predicted transitions at the semiempirical level of theory. The calculated equilibrium constants are in agreement with
已在各种溶剂中测量了从 2-羟基-1-萘醛与甘氨酸、丙氨酸、亮氨酸、缬氨酸和苯丙氨酸衍生的五种席夫碱的电子吸收光谱。观察到的带被分配给适当的电子跃迁,并在半经验理论水平上与预测的跃迁进行比较。计算的平衡常数与实验结果一致,预测所有研究的化合物主要或完全存在于酮亚胺互变异构中。另一方面,已经建立了 ν (cm -1 )(每种化合物的主频率)与众所周知的溶剂参数 ET (30), er, π* 之间的相关性。此外,酸解离常数 pKa 是通过使用三种不同的分光光度法测定的。