查看文章

The trinuclear copper(II) compounds [Cu₃(μ₃-OH)(^GL1)₃](ClO₄)₂ (1–4) and [Cu₃(μ₃-OH)(^GL2)₃](ClO₄)₂ (5–8) with tridentate NNO Schiff base ligands ^GL1⁻ and ^GL2⁻ derived from 5-G-substituted salicylaldehydes (G = NO₂, Br, H, Me) and the diamines 1,2-ethanediamine and 1,3-propanediamine, respectively, were investigated aiming at shedding light on possible magneto-structural correlation in this class of complexes. All derivatives contain [Cu₃(μ₃-OH)(L)₃]²⁺ cations with partial cubane Cu₃O₄ cores, and the metal ions are linked together in a pyramidal fashion by a triple-bridging hydroxido group, giving rise to propellers with three [Cu(L)]⁺ blades. In these spin-frustrated magnetic systems, the three copper(II) ions within a cluster communicate anti-ferromagnetically (−2J Ŝ_i·Ŝ_j convention) through the bridging OH group with coupling constants J ranging from −4.5(1) for 4 (G = Me) to −10.1(1) cm⁻¹ for 1 (G …