Promotion of antiferromagnetic exchange interaction in multinuclear copper(ii) complexes via fused oxamato/oxamidato ligands

Oligo-oxamate type preligands ensure a coplanar orientation of the coordination units of embedded transition metal ions and promote thereby intramolecular magnetic exchange couplings.

Strong antiferromagnetic exchange between manganese phthalocyanine and ferromagnetic europium oxide

A record strong antiferromagnetic exchange interaction between an organic magnetic semiconductor and an insulating ferromagnetic oxide is observed.

An 18-Membered Hexanuclear Manganese (MnN2)6 Metalladiazamacrocycle

The macrocyclic hexanuclear manganese(III) 18-metallacrown-6, [Mn6(pmshz)6(DMF)4(C2H5- OH)2]·4DMF (1), where pmshz3− is N-propionyl-N'-5-methylsalicylhydrazide, has been synthesized by self-assembly and structurally characterized. The ring is formed by the succession of six structural moieties of the type [Mn(III)-N-N] with hydrazide N-N groups bridging the ring Mn ions. The ligand enforces the metal ions to form the stereochemistry of a configuration with alternate. . .ΔΛΔΛ. . .- type enantiomeric chiral units. The peripheral core ring is ~18.6 in diameter and ~12.4 Å in thickness. The title metallacrown exhibits photoluminescent properties in the solid state and a weak antiferromagnetic exchange interaction.