Abstract
The phosphonocarboxylic acid H(HO 3PCH 2) 2NH-CH 2C 6H 4-COOH ( H 5 L ) was synthesized and characterized by NMR- and IR-spectroscopy, thermogravimetric (TG) analysis and single-crystal X-ray diffraction. Reactions of H 5 L with samarium(III) chloride and calcium(II) chloride resulted in three new compounds, Sm[(O 3PCH 2) 2NH-CH 2C 6H 4-COOH]·H 2O ( 1), Ca[H(O 3PCH 2) 2NH-CH 2C 6H 4-COOH]·H 2O ( 2), and Ca[(HO 3PCH 2) 2NH-CH 2C 6H 4-COOH] 2·4H 2O ( 3). The single-crystal structure determination of the title compounds reveals that in H 5 L 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 SmO 8 polyhedra are observed while in 2, isolated units of edge-sharing CaO 6 octahedra and in 3 isolated CaO 6 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.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
