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
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posted on 2005-08-22, 00:00 authored by Simon M. Humphrey, Richard A. Mole, Mary McPartlin, Eric J. L. McInnes, Paul T. WoodHydrothermal 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.
