6533b7d6fe1ef96bd126670f
RESEARCH PRODUCT
Double-CO32− Centered [CoII5] Wheel and Modeling of Its Magnetic Properties
Joan CanoJoan CanoMrinal SarkarValerio BertolasiGuillem AromíDebashis Raysubject
crystal structureCoordination numberInorganic chemistrycarbonatesCatalysisIonCoordination complexMetalMagnetizationCluster (physics)Moleculecarbonate ligandschemistry.chemical_classificationOrganic Chemistrycarbonate ligands; carbonates; cobalt; coordination chemistry; density functional calculations; magnetic properties; spin-orbit coupling; crystal structure.General ChemistrySpin–orbit interactioncobaltspin-orbit couplingCrystallographychemistryvisual_artdensity functional calculationscoordination chemistryvisual_art.visual_art_mediummagnetic propertiesdescription
A high-spin Co(II) cluster with a rare pentagonal molecular structure and formula [Co(5)(CO(3))(2)(bpp)(5)]ClO(4) (1; Hbpp is 2,6-bis(phenyliminomethyl)-4-methylphenolate) has been synthesized and characterized by single-crystal X-ray diffraction. This topology arises from fusing five [Co(2)(bpp)] moieties in a cyclic manner around two CO(3)(2-) central ligands, resulting in propeller-like configuration. The irregular coordination of the carbonate ions to the metal centers results in a combination of coordination numbers (CNs) of the Co(II) ions of five and six. The bulk magnetization of this complicated magnetically exchanged system has been modeled successfully by employing a matrix diagonalization technique. For this, the combination of S=3/2 ions (CN=5) with ions exhibiting strong spin-orbit coupling (CN=6) has been considered and a perturbative approach to handle the data in the whole studied range of temperatures (2-300 K) yielding parameters of g and D (for the five-coordinate Co(II) ions), of A, κ, λ, and Δ (for the metals with spin-orbit coupling) and of the exchange constants J. The agreement with results from DFT calculations, also presented here, is remarkable.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-10-13 | Chemistry - A European Journal |