EPR and magnetic quantum tunneling studies of the mixed valent [Mn4(anca)4(Hedea)2(edea)2]·2CHCl3, EtOH single-molecule magnet
Polyhedron Elsevier 30:18 (2011) 2965-2968
Accidentally on purpose: construction of a ferromagnetic, oxime-based [Mn(III)2] dimer.
Dalton transactions (Cambridge, England : 2003) 40:39 (2011) 9999-10006
Abstract:
The serendipitous self-assembly of the complex [Mn(III)(2)Zn(II)(2)(Ph-sao)(2)(Ph-saoH)(4)(hmp)(2)] (1),whose magnetic core consists solely of two symmetry equivalent Mn(iii) ions linked by two symmetry equivalent -N-O- moieties, provides a relatively simple model complex with which to study the magneto-structural relationship in oxime-bridged Mn(III) cluster compounds. Dc magnetic susceptibility measurements reveal ferromagnetic (J = +2.2 cm(-1)) exchange resulting in an S = 4 ground state. Magnetisation measurements performed at low temperatures and high fields reveal the presence of significant anisotropy, with ac measurements confirming slow relaxation of the magnetisation and Single-Molecule Magnetism behaviour. Simulations of high field, high frequency EPR data reveal a single ion anisotropy, D((Mn(III))) = -3.83 cm(-1). DFT studies on a simplified model complex of 1 reveal a pronounced dependence of the exchange coupling on the relative twisting of the oxime moiety with respect to the metal ion positions, as suggested previously in more complicated [Mn(III)(3)] and [Mn(III)(6)] clusters.Relieving frustration: The case of antiferromagnetic Mn3 molecular triangles
Physical Review B American Physical Society (APS) 84:9 (2011) 094443
Cationic Mn4 single-molecule magnet with a sterically isolated core.
Inorganic chemistry 50:16 (2011) 7367-7369
Abstract:
The synthesis, structure, and magnetic properties of a ligand-modified Mn(4) dicubane single-molecule magnet (SMM), [Mn(4)(Bet)(4)(mdea)(2)(mdeaH)(2)](BPh(4))(4), are presented, where the cationic SMM units are significantly separated from neighboring molecules in the crystal lattice. There are no cocrystallized solvate molecules, making it an ideal candidate for single-crystal magnetization hysteresis and high-frequency electron paramagnetic resonance studies. Increased control over intermolecular interactions in such materials is a crucial factor in the future application of SMMs.Asymmetric Berry-phase interference patterns in a single-molecule magnet.
Physical review letters 106:22 (2011) 227201