Calcium and strontium thiobarbiturates with discrete and polymeric structures
作者： N.N. Golovnev , M.S. Molokeev , S.N. Vereshchagin , V.V. Atuchin
DOI: 10.1080/00958972.2013.860450
关键词: Crystallography 、 Denticity 、 Hydrogen bond 、 Crystal structure 、 Thiobarbiturates 、 Chemistry 、 Alkaline earth metal 、 Infrared spectroscopy 、 Supramolecular chemistry 、 Square antiprism
摘要: Three new alkaline earth metal complexes, [Ca2(H2O)8(μ2-HTBA-O,O′)2(HTBA-O)2] (1), [Ca(H2O)5(HTBA-O)2]·2H2O (2), and [Sr(H2O)4(μ2-HTBA-O,S)2]n (3) (H2TBA = 2-thiobarbituric acid, C4H4N2O2S), were synthesized characterized by FT-IR spectroscopy, TG-DSC, single-crystal powder X-ray diffraction analysis. The data revealed that 1 2 are discrete structures, whereas 3 is a polymer. In 2, Ca2+ seven-coordinate forms monocapped trigonal prism. 1, the prisms pairwise connected with assistance of two [μ2-HTBA-O,O′]− ligands. 3, Sr2+ coordinated four monodentate HTBA− via S or O donors waters, formation distorted square antiprism. antiprisms μ2-O,S bridging HTBA−. Hydrogen bonding involving water π–π interactions plays an important role in construction supramolecular 3-D structures 1–3. Infrared spectroscopic supported structural data. thermal stabilit...
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