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
dataset
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-mnaH<sub>2</sub>) with Co(II) and
Ni(II) leads to two network coordination solids [M<sub>9</sub>(6-mna)<sub>8</sub>(μ<sub>3</sub>-O)<sub>2</sub>(OH<sub>3</sub>)<sub>2</sub>(OH<sub>2</sub>)<sub>6</sub>] (M = Co, Ni), <b>1</b>, and [M<sub>2</sub>Ni<sub>12</sub>(6-mna)<sub>12</sub>(μ<sub>3</sub>-OH)<sub>2</sub>(OH<sub>2</sub>)<sub>6</sub>]·8H<sub>2</sub>O (M = K, Rb, Cs), <b>2</b>. 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 <b>2</b> contains ferromagnetically coupled Ni<sub>6</sub>
wheels.
