title: 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.
abstract: 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(mu3-O)2(OH3)2(OH2)6] (M = Co, Ni), 1, and [M2Ni12(6-mna)12(mu3-OH)2(OH2)6] x 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.
authors.affiliation: University Chemical Laboratory, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, UK.
authors.forename: Simon M
authors.initials: SM
authors.lastname: Humphrey
authors.forename: Richard A
authors.initials: RA
authors.lastname: Mole
authors.forename: Mary
authors.initials: M
authors.lastname: McPartlin
authors.forename: Eric J L
authors.initials: EJ
authors.lastname: McInnes
authors.forename: Paul T
authors.initials: PT
authors.lastname: Wood