Cages on a plane: a structural matrix for molecular 'sheets'.

Cages on a plane: a structural matrix for molecular 'sheets'.
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平面上的笼子:分子“片”的结构矩阵。

DOI:
10.1039/c8dt03793k
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发表时间:
2018
期刊:
2003)
影响因子:
--
通讯作者:
Fraser HWL
Fraser HWL
中科院分区:
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文献类型:
--
作者:
Fraser HWL

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通式[MIII2MII5(HMP)12]4+(MIII2MII5(HMP)12)4+(MIII2MII5(HMP)12),[Cr2Mn5(HMP)12](ClO4)4(2),[Cr2Mn5(HMP)12](ClO4)4(2),[Cr2Mn5(HMP)12](ClO4)4(3),[Cr2Co5(HMP)12](ClO4)4(1),[Cr2Fe5(HMP)12](ClO4)4(2),[Cr2Mn5(HMP)12](ClO4)4(3),[Cr2Cu5(HMP)12](ClO4)2(NO3)2(4)和[Al2Co5(HMP)12](ClO4)4(5)。根据以前的家庭成员,1-5阳离子共同的金属骨架描述了一个中心六边形,两个MIII位在外轮周围无序排列,除了化合物4,其中CuII位是局部化的。只有当MIII=Al和MII=Cu时,才能形成结构相关但扩大的平面圆盘,其每个边缘都有CuII离子覆盖的[MIII6MII]六边形。在[AlIII6CuII7(OH)12(HMP)12](ClO4)6(NO3)2(6)中,Anderson部分包含一个中心的对称八面体CuII离子,周围环绕着AlIII离子的轮子。固态直流磁化率和磁化测量表明,1-5中存在竞争性交换作用,6中CuII离子之间存在非常弱的反铁磁交换,这可能是分子内和/或分子间的交换。
A family of heterometallic Anderson-type ‘wheels’ of general formula [MIII2MII5(hmp)12]4+ (MIII = Cr or Al and MII = Ni or Zn, Hhmp = 2-pyridinemethanol) has been extended to include MIII = Cr or Al and MII = Co, Fe, Mn or Cu, affording five new species of formulae [Cr2Co5(hmp)12](ClO4)4 (1), [Cr2Fe5(hmp)12](ClO4)4 (2), [Cr2Mn5(hmp)12](ClO4)4 (3), [Cr2Cu5(hmp)12](ClO4)2(NO3)2 (4) and [Al2Co5(hmp)12](ClO4)4 (5). As per previous family members, the metallic skeleton common to the cations of 1–5 describes a centred hexagon with the two MIII sites disordered around the outer wheel, with the exception of compound 4 where the CuII sites are localised. A structurally related, but enlarged planar disc possessing a [MIII6MII] hexagon capped on each edge by a CuII ion can be formed, but only when MIII = Al and MII = Cu. In [AlIII6CuII7(OH)12(hmp)12](ClO4)6(NO3)2 (6) the Anderson moiety contains a central, symmetry-imposed octahedral CuII ion surrounded by a wheel of AlIII ions. Solid-state dc susceptibility and magnetisation measurements reveal the presence of competing exchange interactions in 1–5, and very weak antiferromagnetic exchange between the CuII ions in 6 which may be intra- and/or intermolecular in nature.
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