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Potentiometric, UV and H-1 NMR study on the interaction of penicillin derivatives with Zn(II) in aqueous solution

机译:电位,紫外线和H-1 NMR研究青霉素衍生物与Zn(II)在水溶液中的相互作用

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摘要

The interaction of Zn(II) with ampicillin [(2S,5R,6R)-6-([(2R)-2-amino-2-phenylacetyl]amino)-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-2- carboxylic acid] and amoxicillin [(2S,5R,6R)-6-{[(2R)-2-amino-2-(4-hydroxyphenyl)-acetyllamino}-3,3-dimethyl-7-oxo-4-thia-1-azabicyclo[3.2.0]heptane-24-carboxylic acid] in NaCl aqueous solution at different ionic strengths and at t = 25 degrees C was investigated by potentiometric, UV and H-1 NMR techniques. Fairly similar speciation models were obtained for the two systems. At I = 0.15 mol L-1, two different sets of measurements, at low and high concentrations, were carried out. For the Zn2+-amoxicillin system, the Zn2L2(OH)(2) species was obtained in the set of measurements at high concentration. The spectrophotometric and 1H NMR results thus obtained are fully consistent with the speciation models found from potentiometric investigations, confirming the formation as well as the relative stability of the complex species.
机译:Zn(II)与氨苄青霉素的相互作用[(2S,5R,6R)-6 - ([(2R)-2-氨基-2-苯基乙酰基]氨基)-3,3-二甲基-7-氧代4-THIA -1-氮杂双环[3.2.0]庚烷-2-羧酸]和阿莫西林[(2S,5R,6R)-6 - {[(2R)-2-氨基-2-(4-羟基苯基) - 乙酰氨基胺} - 通过电位,UV研究了在不同离子强度和T = 25℃下NaCl水溶液中NaCl水溶液中的3,3-二甲基-7-氧代-4-甲基二酰基 - 24-羧酸]。 和H-1 NMR技术。 为这两个系统获得了相同的形态模型。 在I = 0.15mol L-1,进行两种不同的测量,低浓度和高浓度。 对于Zn2 + -Amoxicillin系统,在高浓度的测量集中获得Zn2L2(OH)(2)种。 由此获得的分光光度和1H NMR结果与来自电位调查的物质模型完全一致,确认形成的形成以及复杂物种的相对稳定性。

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