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New complexes of light lanthanides with the valsartan in the solid state: Thermal and spectroscopic studies
Journal of Analytical and Applied Pyrolysis ( IF 5.8 ) Pub Date : 2018-10-01 , DOI: 10.1016/j.jaap.2018.08.023
Bruno Ekawa , Wilhan Donizete Gonçalves Nunes , José Augusto Teixeira , Marco Aurélio Cebim , Elias Yuki Ionashiro , Flávio Junior Caires

Abstract New lanthanides complexes with valsartan drug (H2Val) with stoichiometry Ln2(Val)3⋅nH2O (Ln = La, Ce, Pr, Nd and Sm) were obtained by reacting a solution of the lanthanide nitrate with a solution of valsartan sodium salt. The complexes were characterized by simultaneous thermogravimetry and differential scanning calorimetry (TG-DSC) in dry air and nitrogen atmospheres, Evolved gas analysis (EGA) by TG-DSC-FTIR, Elemental Analysis (EA), complexometry with EDTA, Fourier transform Infrared and Raman (FTIR and FT-Raman) spectroscopy, UV–vis spectroscopy and Powder X-Ray Diffraction (PXRD). The thermal decomposition of the complexes differed in dry air atmosphere with four steps for Ce, five for La and Pr and six for Nd and Sm. In nitrogen atmosphere all the complexes had a similar behavior, with three mass loss steps up to 1000 °C, leading to the formation of a mixture of carbonized material and metal oxide. The main gaseous products released during the thermal decomposition of these compounds were nitrous oxide, carbon dioxide and carbon monoxide (in air atmosphere), ammonia, nitrous oxide, carbon dioxide, carbon monoxide, and an unsaturated ketone or a mixture of unsaturated hydrocarbon and a ketone (in nitrogen atmosphere). The PXRD data suggest that the compounds are amorphous; the FTIR spectra suggests coordination of the ligand by the tetrazole ring, and by the carboxylate group as monodentate ligand; finally, the UV–vis spectra of the Pr, Nd and Sm complexes provided information about the degree of covalence of each compound.

中文翻译:

轻镧系元素与固态缬沙坦的新配合物:热和光谱研究

摘要 通过将镧系元素硝酸盐溶液与缬沙坦钠盐溶液反应,获得了化学计量为 Ln2(Val)3·nH2O(Ln = La、Ce、Pr、Nd 和 Sm)的新型镧系元素与缬沙坦药物 (H2Val) 的配合物。通过干燥空气和氮气气氛中的同步热重法和差示扫描量热法 (TG-DSC)、通过 TG-DSC-FTIR 进行的逸出气体分析 (EGA)、元素分析 (EA)、EDTA 络合测定法、傅里叶变换红外和拉曼(FTIR 和 FT-拉曼)光谱、紫外-可见光谱和粉末 X 射线衍射 (PXRD)。配合物的热分解在干燥空气中不同,Ce 为四步,La 和 Pr 为五步,Nd 和 Sm 为六步。在氮气氛中,所有配合物都具有相似的行为,三个质量损失步骤高达 1000 °C,导致形成碳化材料和金属氧化物的混合物。这些化合物在热分解过程中释放的主要气态产物是一氧化二氮、二氧化碳和一氧化碳(在空气中)、氨、一氧化二氮、二氧化碳、一氧化碳和不饱和酮或不饱和烃和不饱和烃的混合物。酮(在氮气气氛中)。PXRD 数据表明化合物是无定形的;FTIR 光谱表明配体通过四唑环和作为单齿配体的羧酸根进行配位;最后,Pr、Nd 和 Sm 配合物的紫外-可见光谱提供了有关每种化合物共价程度的信息。这些化合物在热分解过程中释放的主要气态产物是一氧化二氮、二氧化碳和一氧化碳(在空气中)、氨、一氧化二氮、二氧化碳、一氧化碳和不饱和酮或不饱和烃和不饱和烃的混合物。酮(在氮气气氛中)。PXRD 数据表明化合物是无定形的;FTIR 光谱表明配体通过四唑环和作为单齿配体的羧酸根进行配位;最后,Pr、Nd 和 Sm 配合物的紫外-可见光谱提供了有关每种化合物共价程度的信息。这些化合物在热分解过程中释放的主要气态产物是一氧化二氮、二氧化碳和一氧化碳(在空气中)、氨、一氧化二氮、二氧化碳、一氧化碳和不饱和酮或不饱和烃和一氧化碳的混合物。酮(在氮气气氛中)。PXRD 数据表明化合物是无定形的;FTIR 光谱表明配体通过四唑环和作为单齿配体的羧酸根进行配位;最后,Pr、Nd 和 Sm 配合物的紫外-可见光谱提供了有关每种化合物共价程度的信息。和不饱和酮或不饱和烃和酮的混合物(在氮气气氛中)。PXRD 数据表明化合物是无定形的;FTIR 光谱表明配体通过四唑环和作为单齿配体的羧酸根进行配位;最后,Pr、Nd 和 Sm 配合物的紫外-可见光谱提供了有关每种化合物共价程度的信息。和不饱和酮或不饱和烃和酮的混合物(在氮气气氛中)。PXRD 数据表明化合物是无定形的;FTIR 光谱表明配体通过四唑环和作为单齿配体的羧酸根进行配位;最后,Pr、Nd 和 Sm 配合物的紫外-可见光谱提供了有关每种化合物共价程度的信息。
更新日期:2018-10-01
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