Molecular spectroscopy, solvent effect, and DFT studies of azithromycin solvate

IF 4.3 2区化学 Q1 SPECTROSCOPY Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy Pub Date : 2024-08-28 DOI:10.1016/j.saa.2024.125057

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Abstract

Azithromycin ethanol solvate monohydrate [C₃₈H₇₂N₂O₁₂0.5(C₂H₆O)H₂O], abbreviated by AZM-MH-EtOH, was synthesized by slow evaporation method and investigated by powder X-ray diffraction, Raman and infrared (IR) spectroscopy combined with density functional theory (DFT) studies. Electronic and vibrational properties were properly investigated based on a theoretical study of solvation effects, using implicit solvation and solute electron density models. The electronic and vibrational studies were evaluated under aqueous, ethanolic, and vacuum conditions. The electronic structure calculations indicated that the AZM-MH-EtOH is chemically more stable in solvents compared to vacuum condition. Ultraviolet–visible (UV–vis) measurements confirmed the stability of the material in ethanolic medium, due to higher absorbance values compared to the aqueous medium. Vibrational changes were observed in the Raman and IR bands, which have connection with hydrogen bonds. The experimental vibration modes showed better accordance with the predicted modes’ values under solvation effects, but a slight divergence is noticed when we compared to vibration modes obtained in vacuum. Furthermore, the results have revealed a greater affinity profile of AZM-MH-EtOH for water and ethanol solvents compared to theoretical data under vacuum condition.

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阿奇霉素溶胶的分子光谱、溶剂效应和 DFT 研究

采用缓慢蒸发法合成了一水阿奇霉素乙醇溶胶[C38H72N2O120.5(C2H6O)H2O]，简称为 AZM-MH-EtOH，并通过粉末 X 射线衍射、拉曼光谱和红外光谱以及密度泛函理论（DFT）进行了研究。在对溶解效应进行理论研究的基础上，利用隐式溶解和溶质电子密度模型对电子和振动特性进行了适当的研究。电子和振动研究是在水溶液、乙醇和真空条件下进行的。电子结构计算表明，与真空条件相比，AZM-MH-EtOH 在溶剂中的化学性质更加稳定。紫外-可见光（UV-vis）测量证实了该材料在乙醇介质中的稳定性，因为与水介质相比，它的吸光值更高。在拉曼和红外波段中观察到了振动变化，这与氢键有关。实验中的振动模式与溶解效应下的预测模式值更为吻合，但与真空中获得的振动模式相比，则略有不同。此外，与真空条件下的理论数据相比，实验结果表明 AZM-MH-EtOH 与水和乙醇溶剂的亲和性更强。

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来源期刊

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 物理-光谱学

CiteScore

8.40

自引率

11.40%

发文量

1364

审稿时长

40 days

期刊介绍： Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy (SAA) is an interdisciplinary journal which spans from basic to applied aspects of optical spectroscopy in chemistry, medicine, biology, and materials science. The journal publishes original scientific papers that feature high-quality spectroscopic data and analysis. From the broad range of optical spectroscopies, the emphasis is on electronic, vibrational or rotational spectra of molecules, rather than on spectroscopy based on magnetic moments. Criteria for publication in SAA are novelty, uniqueness, and outstanding quality. Routine applications of spectroscopic techniques and computational methods are not appropriate. Topics of particular interest of Spectrochimica Acta Part A include, but are not limited to: Spectroscopy and dynamics of bioanalytical, biomedical, environmental, and atmospheric sciences, Novel experimental techniques or instrumentation for molecular spectroscopy, Novel theoretical and computational methods, Novel applications in photochemistry and photobiology, Novel interpretational approaches as well as advances in data analysis based on electronic or vibrational spectroscopy.