1. Utilizing the Adaptive Polyoxometalate [As W O (H O)] To Support a Polynuclear Lanthanoid-Based Single-Molecule Magnet
- Author
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Ritchie, Chris, Speldrich, Manfred, Gable, Robert W., Sorace, Lorenzo, Kögerler, Paul, and Boskovic, Colette
- Subjects
Lanthanide ,Ligand field theory ,education.field_of_study ,Square antiprismatic molecular geometry ,Chemistry ,Stereochemistry ,Population ,Magnetic susceptibility ,Inorganic Chemistry ,Crystallography ,Polyoxometalate ,Single-molecule magnet ,Physical and Theoretical Chemistry ,education ,Coordination geometry - Abstract
Five members of a new family of polyoxometalate (POM)-ligated tetranuclear rare earth metal complexes have been synthesized and characterized. These compounds have the general formula (HDABCO)8H5Li8[Ln4As5W40O144(H2O)10(gly)2]·25H2O [Ln = Gd (1), Tb (2), Dy (3), Ho (4) and Y = (5), HDABCO = monoprotonated 1,4-diazabicyclooctane, gly = glycine] and were synthesized from the preformed POM precursor [As2W19O67(H2O)]14–. The structure is comprised of two {As2W19O68} building blocks linked by a unit containing four rare earth ions and two additional tungsten centers, with the two glycine ligands playing a key bridging role. Two crystallographically distinct rare earth ions are present in each complex, both of which possess axially compressed, approximate square antiprismatic coordination geometry. The variable-temperature magnetic susceptibility profiles for 2–4 are dominated by population/depopulation of the MJ sublevels of the relevant ground terms, and fitting of the data has afforded the ligand field param...
- Published
- 2011
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