Synthesis, structure and magnetic study of a novel mixed-valent Co(II)10Co(III)4 shield constructed by mixed pyridine-alcoholate ligands.
Synthesis, structure and magnetic study of a novel mixed-valent Co(II)10Co(III)4 shield constructed by mixed pyridine-alcoholate ligands.
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DOI：
10.1039/c2dt12487d
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发表时间：
2012-03
影响因子：
4
通讯作者：
Yan Peng;C. Tian;Huabin Zhang;Zhihua Li;P. Lin;S. Du
中科院分区：
文献类型：
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作者：
Yan Peng;C. Tian;Huabin Zhang;Zhihua Li;P. Lin;S. Du
用2-羟甲基吡啶(HMPH)和2，6-吡啶二甲醇(2)的混合配体合成了一种新型的十四核混价钴簇合物[Co(II)(10)Co(III)(4)(OH)(2)O(6)(hmp)(10)(pdm)(4)(CH(3)OH)(2)]·5H(2)O(1)。1中的钴离子由10个螯合的HMP(-)配体、4个三配位的Pd2-配体和6个μ(3)-氧化物/氢氧化物阴离子连接在一起，形成了钴基团簇中罕见的屏蔽状平面结构。化合物1在4.5K以下的静态零场下表现出轻微的频率依赖性，表明它可能是单分子磁体。
A novel tetradecanuclear mixed-valent cobalt cluster, formulated as [Co(II)(10)Co(III)(4)(OH)(2)O(6)(hmp)(10)(pdm)(4)(CH(3)OH)(2)]·5H(2)O (1), was obtained using mixed ligands of 2-(hydroxymethyl)pyridine (hmpH) and 2,6-pyridinedimethanol (pdmH(2)). The cobalt ions in 1 are connected by ten chelating hmp(-) ligands, four tris-chelating pdm(2-) ligands and six μ(3)-oxide/hydroxide anions, forming a unique shield-like planar structure that is rarely observed for Co-based clusters. Compound 1 displays slight frequency dependence at static zero field below 4.5 K, suggesting that it might be a single molecule magnet (SMM).