Strong Antiferromagnetic Interaction in a Gadolinium(III) Complex with Methoxy-TEMPO Radical: A Relation between the Coupling and the Gd–O–N Angle
Takeshi Nakamura, Takuya Kanetomo, Takayuki Ishida
Abstract
A new compound [Gd(hfac)3(MeOTEMPO)(MeOH)] (MeOTEMPO = 4-methoxy-2,2,6,6-tetramethylpiperidin-1-oxyl) was prepared. From the X-ray crystal structure analysis, the Gd–O–N angle is 170.9(3)°. The magnetic study clarified the Gd3+–radical interaction with 2J/kB = −26.6(3) K (in the H = −2JS1·S2 convention), which corresponds to one of the strongest antiferromagnetic couplings in the Gd–nitroxide systems. Wider Gd–O–N angles seem to favor stronger antiferromagnetic couplings.
Topics & Concepts
ChemistryAntiferromagnetismNitroxide mediated radical polymerizationGadoliniumCrystallographyCoupling (piping)Crystal structureNuclear magnetic resonanceInductive couplingCondensed matter physicsOrganic chemistryPhysicsMechanical engineeringEngineeringRadical polymerizationCopolymerQuantum mechanicsPolymerMagnetism in coordination complexesLanthanide and Transition Metal ComplexesElectron Spin Resonance Studies