Synthesis and characterisation of dinuclear and mononuclear Cobalt (II) benzoate complexes

Anirban Karmakar; Rupam J. Sarma; Jubaraj B. Baruah

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Synthesis and characterisation of dinuclear and mononuclear Cobalt (II) benzoate complexes

机译：双核和单核苯甲酸钴（II）配合物的合成与表征

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Aqua-bridged binuclear cobalt (II) benzoate complexes having pyridine as auxiliary ligands are synthesised through solid state reactions and characterised. The binuclear core in these complexes comprise of two bridging benzoates and an aqua bridge. Each of the cobalt (II) centre is further co-ordinated to one benzoate and two pyridine ligands. The aqua-bridged cobalt (II) benzoate complex [Co2(μ-H2O)(μ-OBz)2(OBz)2(Py)4] · (C6H6)(BzOH) (1a) is inclusion compounds with benzoic acid and benzene (where OBz = benzoate, py = pyridine). Analogous complex [Co2(μ-H2O)(μ-OBz)2(OBz)2(Py)4] · 1.5(C6H6) without benzoic acid included is also prepared by an alternative method and structurally characterised. Analogous aqua-bridged complex derived from p-chlorobenzoic acid in unsolvated form is characterised. The Co–O–Co separation in these complexes is in the range of 3.55–3.64 ? with angles Co–O–Co varying from 111.8° to 116.4°. While similar reaction in solution leads to the formation of mononuclear complex having composition [Co(OBz)2(Py)2(H2O)]. The unsubstituted benzoate complex 1a can be easily oxidised to form a tetrameric cobalt (III) complex having benzoate and oxo-bridged structure with a Co4O4 core.

机译：通过固态反应合成并表征具有吡啶作为辅助配体的水桥双核钴（II）苯甲酸酯钴络合物。这些络合物中的双核核心包含两个桥连苯甲酸酯和一个水桥。每个钴（II）中心还与一个苯甲酸酯和两个吡啶配体配位。水桥联苯甲酸钴（II）络合物[Co2（μ-H2O）（μ-OBz）2（OBz）2（Py）4]·（C6H6）（BzOH）（1a）是与苯甲酸和苯形成的包合物（其中OBz =苯甲酸酯，py =吡啶）。还通过另一种方法制备了不包含苯甲酸的类似配合物[Co2（μ-H2O）（μ-OBz）2（OBz）2（Py）4]·1.5（C6H6），并对其结构进行了表征。表征了以非溶剂化形式衍生自对氯苯甲酸的类似水桥复合物。这些配合物中的Co-O-Co分离范围为3.55-3.64？ Co–O–Co的角度在111.8°至116.4°之间变化。溶液中类似的反应导致形成具有组成[Co（OBz）2（Py）2（H2O）]的单核络合物。未取代的苯甲酸酯络合物1a可以容易地被氧化形成具有苯甲酸酯和具有Co 4 O 4核的氧代桥连结构的四聚钴（III）络合物。

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来源
《Polyhedron: The International Journal for Inorganic and Organometallic Chemistry》 |2007年第6期|共9页
作者
Anirban Karmakar; Rupam J. Sarma; Jubaraj B. Baruah;
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原文格式 PDF
正文语种 eng
中图分类化学;
关键词
Binuclear cobalt complexes; Aqua bridge; Acid-inclusion; Oxidation;

机译：双核钴配合物;水桥;酸包合物;氧化;

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Synthesis and characterisation of dinuclear and mononuclear Cobalt (II) benzoate complexes

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