Synthesis, Crystal Structures, and Magnetic Properties of New Hexanuclear Mn^III₂Ln^III₄ Complexes: SMM Behavior of the Terbium(III) Analogue

Abstract

This investigation reports the syntheses, crystal structures, and magnetic properties of a series of isomorphous hexanuclear Mn III 2 Ln III 4 compounds of composition [Mn III 2 Ln III 4 L 1 2 L 2 2 (μ 3 -OH) 4 (μ 1,3 -Pivalate) 6 (NO 3 ) 2 ]·2CH 3 CN {Ln = Tb (1), Dy (2), Ho (3), Er (4)}, where H 2 L 1 is the Schiff base ligand that is obtained by [1+1] condensation of 3-methoxysalicylaldehyde (HL 2 ) with 2-amino-2-methyl-1-propanol. While the O(phenoxo)N(imine)O(alkoxo) pocket of the ligand [L 1 ] 2binds a Mn III ion, the other pocket, O(methoxy)O(phenoxo), remains noncoordinated. In contrast, each of the O(methoxy)O(phenoxo) and O(phenoxo)O(aldehyde) sites of [L 2 ]is occupied by a [a]