6533b827fe1ef96bd128642a

RESEARCH PRODUCT

Exchange coupling in a thiocyanato-bridged copper(II) chain: Computational approach to magnetostructural correlations

Carla BazzicalupiLorena MartínezNicolás VeigaCarlos KremerAntonio BianchiFrancesc LloretRaúl Chiozzone

subject

chemistry.chemical_classificationKetoneChemistrychemistry.chemical_elementOximeCopperMagnetic susceptibilitySquare pyramidal molecular geometryInorganic Chemistrychemistry.chemical_compoundBipyramidCrystallographyFerromagnetismMaterials ChemistryPhysical and Theoretical ChemistryCoordination geometry

description

Abstract In this article we report the synthesis and magneto-structural characterization of two new copper(II) compounds with thiocyanato and methyl(2-pyridil) ketone oxime (mpkOH), namely [Cu(NCS)(mpkO)(mpkOH)] (1) and [Cu(µ-NCS)(NCS)(mpkOH)]n (2). Compound 1 is a mononuclear complex that crystallizes as discrete units. Conversely, compound 2 is a single equatorial-axial end-to-end thiocyanato bridged polymeric chain of Cu(II) with the oxime as a co-ligand. The coordination geometry around the Cu(II) centers is distorted square pyramidal for 1 and 2. The magnetic susceptibility data for 2 reveal weak intrachain antiferromagnetic coupling, with J value −0.74(3) cm−1 and g  = 2.10(1). The application of computational tools to a binuclear model of 2 allowed us to unveil the structural basis that modulates the magnetic behavior of this type of thiocyanato-bridged Cu(II) chains. The results suggest that although small values of J are expected, the strongest ferromagnetic interactions can be obtained by including co-ligands that trigger a squared-based pyramidal-to-trigonal bipyramidal distortion of the coordination polyhedra.

yearjournalcountryeditionlanguage
2021-11-01Polyhedron
https://doi.org/10.1016/j.poly.2021.115406