Syntheses, structures and magnetism of mixed-valence Mn19 and Mn21 complexes supported by alkylamine-based alkoxo-bridging ligands†
Abstract
Two new high-nuclearity mixed-valence Mn clusters, Mn19 and Mn21, were synthesised utilising an alkylamine-based flexible ligand with five alkoxo-bridging groups, 1,3-bis-diethanolamino-2-propanol (H5bdp). They were obtained from the reaction of Mn(O2CPh)2·2H2O with H5bdp·2HCl·H2O and Et3N in a 4 : 1 : 7 molar ratio in CH3CN/CH3OH mixed solution. The X-ray crystal structures revealed {MnII8MnIII10MnIV} and {MnII6MnIII15} mixed-valence cores composed around {Mn7O8} corner-shared double cubanes. Magnetic susceptibility measurements on both complexes indicated dominant intramolecular antiferromagnetic interactions between Mn ions. No clear SMM behaviour was observed above 1.8 K due to the non-parallel alignment of magnetic anisotropy axes of the MnIII ions.
- This article is part of the themed collection: Molecular Magnetism themed collection