A novel tetranuclear lanthanide(III)–copper(II) complex of the macrocyclic oxamide [PrCu3] (macrocyclic oxamide = 1,4,8,11-tetraazacyclotradecanne-2,3-dione): synthesis, structure and magnetism

A novel tetranuclear lanthanide(III)–copper(II) complex of macrocyclic oxamide, [Pr(CuL)3(H2O)2](SCN)3 · 1.5H2O (L = 1,4,8,11-tatraazacyclotradecanne-2,3-dione) (1), has been synthesized, structurally characterized and preliminary investigated by magnetic studies. The structure of the title complex consists of a cationic PrCu3 core, noncoordinated monovalent SCN− anions and H2O molecules; the packing diagram shows open channels formed through intermolecular weak interactions. The temperature-dependent magnetic susceptibilities were analyzed by an approximate treatment being enlightened by Matsumoto et al. leading to J = −1.62 × 10−2 cm−1, Δ = 3.12 cm−1, gCu = 2.13, respectively.