Structure and Magnetic Properties of Lanthanide Compounds with the 3,6-Di(Tert-Butyl)-1,2-Benzoquinone Radical Anion

Abstract

Molecular and crystal structures of mononuclear lanthanide (Ln) compounds with the 3,6-di(tert-butyl)-1,2-benzoquinone (SQ) radical anion of the composition [Ln(SQ)₃(THF)₂] (Ln = Pr, Nd, Eu, Tb, Dy), [Ln(SQ)₃(Q)], (Ln = Gd, Eu; Q – 3,6-di(tert-butyl)-1,2-benzoquinone), [La(SQ)₃(Q)(THF)], [Ce^IV(SQ)₄], [NaLn(SQ)₄(THF)₃]·0.25C₆H₁₄ (Ln = Gd, Tb), [NaLn(SQ)₄(Q)(THF)] (Ln = La, Pr) are determined. The study of the magnetic properties of isolated heterospin solid phases reveals that intramolecular antiferromagnetic exchange interactions between unpaired electrons of SQ moieties dominate in them. At T≤2 K [Dy(SQ)₃(THF)₂] exhibits the properties typical of a metamagnetic compound.