Isolated Magnetic Clusters of Co(II) and Ni(II) within 3-Dimensional Organic Frameworks of 6-Mercaptonicotinic Acid: Unique Structural Topologies Based on Selectivity for Hard and Soft Coordination Environments

Hydrothermal reaction of the mixed thiolate−carboxylate−aromatic
amine ligand, 6-mercaptonicotinic acid (6-mnaH2) with Co(II) and
Ni(II) leads to two network coordination solids [M9(6-mna)8(μ3-O)2(OH3)2(OH2)6] (M = Co, Ni), 1, and [M2Ni12(6-mna)12(μ3-OH)2(OH2)6]·8H2O (M = K, Rb, Cs), 2. These compounds are unusual
for two reasons:  they are thiolate-bridged networks and they are
three-dimensional lattices which contain isolated metal clusters and
chains. The magnetic behavior of these compounds has been
studied, showing that 2 contains ferromagnetically coupled Ni6
wheels.

混合巯基-羧基-芳香胺配体6-巯基烟酸（6-mnaH2）与Co(II)和Ni(II)发生的氢热反应，生成了两种网络配位固体[M9(6-mna)8(μ3-O)2(OH3)2(OH2)6] (M = Co, Ni) 1，以及[M2Ni12(6-mna)12(μ3-OH)2(OH2)6]·8H2O (M = K, Rb, Cs) 2。这些化合物之不寻常之处在于两点：首先，它们是由巯基桥连的网络结构；其次，它们是含有孤立金属簇和链的三维晶格。对这些化合物的磁性行为已进行研究，结果显示2中含有铁磁性耦合的Ni6轮。