Hexanuclear manganese(III) single-molecule magnets from derivatized salicylamidoximes

Abstract

Four novel hexanuclear manganese(III) complexes based on derivatized salicylamidoximes, [Mn III 6 (μ 3 -O) 2 (O 2 CPh) 2 (Me 2 N-sao) 6 (EtOH) 4 ] ( 1 ), [Mn III 6 (μ 3 -O) 2 (O 2 CPh) 2 (Me 2 N-sao) 6 ( i PrOH) 4 ] ( 2 ), [Mn III 6 (μ 3 -O) 2 (O 2 CPh) 2 (Et 2 N-sao) 6 (EtOH) 4 ] ( 3 ) and [Mn III 6 (μ 3 -O) 2 (O 2 CPh) 2 (Et 2 N-sao) 6 ( i PrOH) 4 ] ( 4 ) (Me 2 N-Hsao = dimethylsalicylamidoxime; Et 2 N-Hsao = diethylsalicylamidoxime), have been prepared and characterized. Single-crystal X-ray diffraction allows one to determine that 1 ·2CHCl 3 and 4 crystallize in the triclinic system with space group P (–1), whereas 3 crystallizes in the monoclinic system with space group P 2 1 / n . dc and ac magnetic susceptibility measurements of 1 - 4 reveal ferromagnetic coupling between Mn(III) metal ions and single-molecule magnet behaviour. The anisotropy barriers are 56, 52, 71 and 59 K for 1 , 2 , 3 and 4 , respectively.