EaStCHEM School of Chemistry, The University of Edinburgh, David Brewster Road, Edinburgh, EH9 3FJ Scotland, UK.
Dalton Trans. 2018 Nov 21;47(43):15530-15537. doi: 10.1039/c8dt03793k. Epub 2018 Oct 19.
A family of heterometallic Anderson-type 'wheels' of general formula [MM(hmp)] (M = Cr or Al and M = Ni or Zn, Hhmp = 2-pyridinemethanol) has been extended to include M = Cr or Al and M = Co, Fe, Mn or Cu, affording five new species of formulae CrCo(hmp) (1), CrFe(hmp) (2), CrMn(hmp) (3), CrCu(hmp)(NO) (4) and AlCo(hmp) (5). As per previous family members, the metallic skeleton common to the cations of 1-5 describes a centred hexagon with the two M sites disordered around the outer wheel, with the exception of compound 4 where the Cu sites are localised. A structurally related, but enlarged planar disc possessing a [MM] hexagon capped on each edge by a Cu ion can be formed, but only when M = Al and M = Cu. In AlCu(OH)(hmp)(NO) (6) the Anderson moiety contains a central, symmetry-imposed octahedral Cu ion surrounded by a wheel of Al 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 Cu ions in 6 which may be intra- and/or intermolecular in nature.
一个具有安德森型“轮”结构的杂核金属配合物家族，通式为[MM(hmp)]（M = Cr 或 Al，M = Ni 或 Zn，Hhmp = 2-吡啶甲醇），已经扩展到包括 M = Cr 或 Al 和 M = Co、Fe、Mn 或 Cu，得到了五个新的配合物，化学式为CrCo(hmp)（1）、CrFe(hmp)（2）、CrMn(hmp)（3）、CrCu(hmp)(NO)（4）和AlCo(hmp)（5）。与之前的家族成员一样，1-5 中阳离子的金属骨架描述了一个中心六边形，两个 M 位点围绕外轮无序排列，化合物 4 除外，其中 Cu 位点定位。可以形成一个结构相关但更大的平面圆盘，每个边缘由一个 Cu 离子封端的[MM]六边形，但只有当 M = Al 和 M = Cu 时才可以。在AlCu(OH)(hmp)(NO)（6）中，安德森部分包含一个中心对称的八面体 Cu 离子，周围是一个 Al 离子的轮。固态直流磁化率和磁化强度测量表明，1-5 中存在竞争的交换相互作用，6 中 Cu 离子之间存在非常弱的反铁磁交换，可能是分子内和/或分子间的性质。
