Inorganic–organic hybrid framework materials: Synthesis and characterization of [{Co(H₂O)(L)}₂V₄O₁₂] (L = pyridine, 4-methlypyridine)

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• 作者：M. Ishaque Khan ; Elizabeth Yohannes ; Robert J. Doedens ; Vladimir O. Golub ; Charles J. O&#x2019 ; Connor
• 关键词：Inorganic&#x2013 ; organic hybrid materials ; Framework structure ; Vanadium oxide ; Crystal structure ; Magnetic properties
• 刊名：Journal of Molecular Structure
• 出版年：2008
• 出版时间：15 October 2008
• 年：2008
• 卷：888
• 期：1-3
• 页码：19-24
• 全文大小：407 K

文摘

Inorganic–organic hybrid materials – [{Co(H₂O)(py)}₂V₄O₁₂] (1) and [{Co(H₂O)(pic)}₂V₄O₁₂] (pic = 4-methylpyridine) (2) have been synthesized and characterized by FT-IR spectroscopy, thermogravimetric analysis, elemental analysis, manganometric titration, temperature dependent magnetic susceptibility measurement, bond valence sum calculations, and single crystal X-ray diffraction analyses. Crystals of 1–2 have very similar structures. The two-dimensional framework structures consist of bimetallic oxide layers, composed of {VO₄} tetrahedra and {CoO₅N} octahedra bridged by oxygen atoms, with pyridine rings projecting outward on both sides of the layers. The 12 membered metallocycles – {Co₂V₄O₆} – in the layers generate cavities. The hydrophobic pyridine rings engage in π-stacking with the aromatic rings from adjacent layers. Crystal data for 1; C₁₀H₁₄Co₂N₂O₁₄V₄, triclinic space group , a = 7.7952(8), b = 10.9620(11), c = 12.8778(13) Ǻ, α = 65.940(2), β = 89.318(2), γ = 88.762(2), Z = 2; crystal data for 2: C₁₂H₁₈N₂Co₂O₁₄V₄, monoclinic space group P2₁/m, a = 10.9361(15), b = 7.8201(11), c = 14.0224(19) Ǻ, α = 90.0, β = 112.314(2), γ = 90.0, Z = 2.