期刊
JOURNAL OF SOLID STATE CHEMISTRY
卷 179, 期 1, 页码 145-155出版社
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jssc.2005.10.008
关键词
metal phosphonates; phosphonocarboxylic acid; inorganic-organic hybrid compounds; crystal structure; samarium; calcium
The phosphonocarboxylic acid H(HO3PCH2)(2)NH-CH2C6H4-COOH (H5L) was synthesized and characterized by NMR- and IR-spectroscopy, thermogravimetric (TG) analysis and single-crystal X-ray diffraction. Reactions of H5L with samarium(III) chloride and calcium(II) chloride resulted in three new compounds, SM[(O3PCH2)(2)NH-CH2C6H4-COOH] (.) H2O (1), Ca[H(O3PCH2)(2)NH-CH2C6H4-COOH] (.) H2O (2), and Ca[(HO3PCH2)(2)NH-CH2C6H4-COOH](2) (.) 4H(2)O (3). The single-crystal structure determination of the title compounds reveals that in H5L as well as in compounds 1, 2, and 3 zwitterions are present. Within the M-O building units of the metal phosphonates we observed a different degree of dimensionality, depending on the oxidation state of the metal ion and the synthesis conditions. In 1, one-dimensional chains of edge-sharing SmO8 polyhedra are observed while in 2, isolated units of edge-sharing CaO6 octahedra and in 3 isolated CaO6 octahedra are observed. However, looking at the organic part, the rigid phenyl carboxylic acid moieties arrange in a zipper-like fashion and hydrogen bonding plays an important role in the stabilization of the crystal structure. The title compounds were further characterized by IR spectroscopy and TG analysis. Additionally, the thermal stability of 1 was investigated by temperature-dependent X-ray diffraction. (c) 2005 Elsevier Inc. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据