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反式-二(吡啶-4-甲酸)四水鈷(Ⅱ)配位化合物合成與晶體結構分析

Synthesis and Crystal Structure of the Coordination Compound Trans-tetraaquabis (Pyridine-4-Carboxylate-kN)-Cobalt(Ⅱ)

摘要


將 CoBr2‧xH2O加吡啶-4-甲酸和乙二胺(en)加水混合,利用水熱合成,得到含鈷(Ⅱ)的配位化合物,其化學式為:反式-[Co(pya)2(H2O)4](pya =吡啶-4-甲酸根)。利用X-Ray晶體繞射儀、FT-IR光譜儀及元素分析儀測定產物晶體結構及性質。化合物以鈷(Ⅱ)離子為配位中心,於赤道上反式位置上含兩個吡啶環上的N原子及兩個配位水分子的O原子,而軸上配位兩個水分子的O原子,構成六配位的正八面體型的幾何結構,具有D2h的對稱性。化合物由於配位水分子以及吡啶-4-甲酸,因分子間的氫鍵作用,以及吡啶環之間的π...π吸引力,使得此晶體自組裝成3-D無限延伸的網狀結構。

並列摘要


A coordination compound with the formula trans-[Co(pya)2(H2O)4] (pya =pyridine-4-carboxylate), is hydrothermal synthesized from the reaction of CoBr2‧xH2O, ethylenediamine, and pyridine-4-carboxylic acid. The title compound is fully characterized by X-Ray, FT-infrared and elemental analysis. The title compound, the coordination sphere of the Co(Ⅱ) metal, is octahedral coordination with an approximate D2h symmetry. The arrangements around the Co(Ⅱ) ion is trans-octahedra with two pyridyl nitrogen and two aqua oxygen in the equatorial positions and two aqua oxygen in the axial positions. In addition, the intermolecular O-H...O hydrogen-bonding and π…π stacking interactions further extend the title compound to form a 3-D structure.

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