六水磷酸铵镁(鸟粪石)及其同形类似物的红外和拉曼光谱。十、六水合砷酸铷镁和六水合砷酸铊镁的振动谱

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2020-12-11 DOI:10.20450/mjcce.2020.2168

V. Stefov, V. Koleva, M. Najdoski, A. Cahil, Z. Abdija

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引用次数: 2

摘要

首次用沉淀法制备了鸟粪石型MgRbAsO4·6H2 O和MgTlAsO4·6 H2 O的多晶样品，它们既有质子形式，也有氘化形式。对它们在室温（RT）和液氮温度（LNT）下记录的红外（IR）和拉曼（R）光谱进行了详细分析，并提出了振动带的分配。观察到的光谱图证实了两种砷酸盐的同构性与结构数据一致。与其他鸟粪石类型和结构相关的砷酸盐类似，n1（AsO4）模式出现的频率高于N3（Aso4）振动。在所研究化合物的LNT IR光谱中，在500 cm–1以下，铷类似物在472 cm–1和445 cm–1，铊类似物在470 cm–1到440 cm–1处观察到可归因于拉伸Mg–O振动和n 4（AsO 4）模式的低强度和温度敏感带。在远红外和拉曼光谱中，在400 cm–1和200 cm–1之间观察到许多谱带，其中大多数对氘化敏感，这表明它们不是纯的，而是耦合的，并且可能与n（Mg–Ow）模式有关。另一方面，质子化合物光谱中约405 cm–1的谱带很可能是由于N2（AsO4）模式，因为它的频率位置、强度和对氘化的轻微敏感性。

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Infrared and Raman spectra of magnesium ammonium phosphate hexahydrate (struvite) and its isomorphous analogues. X. Vibrational spectra of magnesium rubidium arsenate hexahydrate and magnesium thallium arsenate hexahydrate

Polycrystalline samples of struvite-type MgRbAsO 4 ·6H 2 O and MgTlAsO 4 ·6H 2 O in both protiated and deuterated forms have been prepared for the first time by a precipitation method. Detailed analysis of their infrared (IR) and Raman (R) spectra recorded at room temperature (RT) and liquid nitrogen temperature (LNT) has been carried out and assignment of the vibrational bands has been proposed. The observed spectral pictures confirm the isostructurality of the two arsenate salts in agreement with the structural data. Similarly to other struvite-type and structure-related arsenate salts, the n 1 (AsO 4 ) modes appear at higher frequencies than the n 3 (AsO 4 ) vibrations. Low intensity and temperature sensitive bands that could be assigned as due to stretching Mg–O vibrations and n 4 (AsO 4 ) modes are observed below 500 cm –1 in the LNT IR spectra of the studied compounds, at 472 cm –1 and 445 cm –1 for the rubidium analogue and at 470 cm –1 and 440 cm –1 for the thallium analogue. In the far-infrared and Raman spectra many bands are observed between 400 cm –1 and 200 cm –1 , most of which are sensitive to deuteration, suggesting that they are not pure but coupled and can be related to n(Mg–Ow) modes. On the other hand, a band around 405 cm –1 in the spectra of the protiated compounds most probably is due to n 2 (AsO 4 ) mode because of its frequency position, intensity and slight sensitivity to deuteration.

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.