ChemPlusChem · 2019 · 15 citations · 17 references
Natural SciencesChemistryMaterials ScienceCrystal StructureMagnetic MaterialsPhysical ChemistryAntiferromagnetic MaterialsAntiferromagnetismExchange InteractionsMagnetic Properties Of SolidsMagnetism In SolidsMagnetism Of Inorganic CompoundsAntiferromagnetic CouplingAntiferromagnetic ExchangeMagnetic Properties Of Transition Metal ComplexesMagnetism Of Transition Metal ComplexesSonogashira Coupling
Abstract An antiferromagnetically (AFM) coupled biradical based on oxoverdazyl and nitronylnitroxide was synthesized in 46 % yield using Sonogashira coupling. The obtained heterobiradical evidenced distinct properties of both radical entities in solution. Depending on the solvent, the prepared biradical crystallized in two different forms. SQUID magnetization measurements on Form II showed coupling constants J intraII /k B =−2.1 K and z J interII /k B =−11.5 K. Consequently, total intermolecular exchange interactions are five times larger than the intramolecular ones. Further, DFT calculations explained this phenomenon and indicated the advantage of Form I for further in‐depth investigations.
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