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
datasetposted on 22.08.2005 by Simon M. Humphrey, Richard A. Mole, Mary McPartlin, Eric J. L. McInnes, Paul T. Wood
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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.