Rageh Nasr M
Department of Chemistry, Faculty of Science, South Valley University, Qena, Egypt.
Spectrochim Acta A Mol Biomol Spectrosc. 2004 Jul;60(8-9):1917-24. doi: 10.1016/j.saa.2003.10.007.
Infrared and electronic spectra were used to investigate the tautomerism of some azo compounds, in both the solid and solution states. It was found that the compounds exist in azo<==>hydrazone tautomeric equilibrium in solid and in solutions. The different bands displayed in the electronic spectra of the compounds in various organic solvents are assigned to the suitable electronic transitions. The solvatochromic behavior of the compounds was investigated by studying their visible spectra in pure and mixed organic solvents. DeltaG and formation constant, Kf, values of the molecular complexes formed in solution have been determined. Effect of concentration of the compounds in DMF and EtOH solutions has been investigated. The basicity and acidity constants of the different compounds were determined from the spectra of these compounds in aqueous-ethanolic solutions of varying pH values. Some complexes of copper(II) with these compounds in solution were tested as for their antibacterial and antifungal activity.
利用红外光谱和电子光谱研究了一些偶氮化合物在固态和溶液状态下的互变异构现象。研究发现，这些化合物在固态和溶液中均以偶氮⇌腙互变异构平衡存在。化合物在各种有机溶剂中的电子光谱中显示的不同谱带被指定为合适的电子跃迁。通过研究化合物在纯有机溶剂和混合有机溶剂中的可见光谱，研究了它们的溶剂化显色行为。测定了溶液中形成的分子配合物的ΔG和形成常数Kf值。研究了化合物在DMF和乙醇溶液中的浓度影响。根据这些化合物在不同pH值的乙醇水溶液中的光谱，测定了不同化合物的碱度和酸度常数。测试了溶液中铜（II）与这些化合物形成的一些配合物的抗菌和抗真菌活性。
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