Gaballa Akmal S, Amin Alaa S
Faculty of Specific Education, Zagazig University, Zagazig, Egypt.
Chemistry Department, Faculty of Science, Benha University, Benha, Egypt.
Spectrochim Acta A Mol Biomol Spectrosc. 2015 Jun 15;145:302-312. doi: 10.1016/j.saa.2015.03.005. Epub 2015 Mar 10.
The reactions of electron acceptors such as picric acid (HPA) and 7,7',8,8'-tetracyano-p-quinodimethane (TCNQ) with 2-hydroxypyridine (HPyO) have been investigated in EtOH at room temperature. Based on elemental analysis and IR spectra of the solid CT-complexes along with the photometric titration curves for the reactions, the data obtained indicate the formation of 1:1 charge transfer complexes [(H2PyO)(PA)] and [(PyO)(HTCNQ)], respectively. The infrared and (1)H NMR spectroscopic data indicate a charge transfer interaction associated with a proton migration from the acceptor to the donor followed by intramolecular hydrogen bonding in [(H2PyO)(PA)] complex. Another charge transfer interaction was observed in [(PyO)(HTCNQ)] complex. The formation constants (KCT) for the CT-complexes are shown to be strongly dependent on the type and structure of the electron acceptors. Factors affecting the CT-processes and the kinetics of thermal decomposition of the complexes have been studied. The CT complexes were screened for their antibacterial activities against selected bacterial strains.
在室温下，已在乙醇中研究了苦味酸（HPA）和7,7',8,8'-四氰基对苯二醌二甲烷（TCNQ）等电子受体与2-羟基吡啶（HPyO）的反应。基于固体CT配合物的元素分析和红外光谱以及反应的光度滴定曲线，所获得的数据表明分别形成了1:1电荷转移配合物[(H2PyO)(PA)]和[(PyO)(HTCNQ)]。红外光谱和(1)H NMR光谱数据表明，在[(H2PyO)(PA)]配合物中，电荷转移相互作用与质子从受体迁移到供体随后分子内形成氢键有关。在[(PyO)(HTCNQ)]配合物中观察到了另一种电荷转移相互作用。结果表明，CT配合物的形成常数（KCT）强烈依赖于电子受体的类型和结构。已研究了影响CT过程的因素以及配合物热分解的动力学。对CT配合物针对选定细菌菌株的抗菌活性进行了筛选。
