Abstract
Following the idea of Lines a combined model for the description of exchange interactions in binuclear lanthanide compounds is proposed. Susceptibility expressions for lanthanide centres with an odd number of f electrons are developed assuming cubic ligand fields and isotropic exchange interactions. The latter are taken into consideration as a molecular field in the excited single-ion levels, but treated with greater accuracy using the Heisenberg model within the single-ion ground states. Model calculations on the basis of an antiferromagnetic coupling within the dimers show that temperatures where magnetic susceptibilities reach their maximum, T (χmax), vary widely when total spin S of the lanthanide is altered. The highest T (χmax) should be expected in the case of Gd 3+ (4f 7), Sm 3+ (4f 5) and Dy 3+ (4f 9). This is confirmed by experimental results so far obtained regarding binuclear complexes [Ln(C 5H 5) 2Br] 2 (Ln = Gd, Dy, Er and Yb).
Published Version
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