Family of Quasi-Isotropic Mn and Mn Complexes Exhibiting Slow Relaxation of the Magnetization.

Slow relaxation of magnetization has been studied for a family of mononuclear Mn complexes and one ferromagnetic dinuclear system, all of them presenting very weak anisotropy. Complexes with formula [{NiL1Mn(HO)(MeOH)}{NiL1}](ClO) (), [Mn{NiL1}](ClO) (), [Mn{NiL2}](ClO) (RR-L2, RR, SS-L2, SS), [Mn{NiL3}](ClO) (RR-L3, RR, SS-L3, SS) and (μ-N)[NiMn(L1)(N)] () are derived from compartmental Schiff bases, in which the Ni environment is square planar and thus diamagnetic. All of the systems have been structurally and magnetically characterized.

Magnetic and optical studies of a new family of multidimensional and multiproperty PO-lanthanide(III) derived systems.

A new family of lanthanide compounds has been synthesized using 1,2-bis(diphenylphosphino)ethane dioxide (dppeO) as an O-donor ligand through the phosphoryl group to lanthanide(III) cations and structurally, magnetically and optically studied. Depending on the lanthanide, two different topologies appear: the two-dimensional structure [Ln(dppeO)(NO)(HO)] (Ln = Ce (1), Sm (2) and Dy (6)) and the one-dimensional structure [Ln(dppeO)(NO)DMF] (Ln = Eu (3), Gd (4) and Tb (5)). Some of the Ln-derived complexes have been used as structural probes, while others have been synthesized to use the specific characteristics of each cation to take advantage of their magnetic/luminescence properties.

Occurrence of slow relaxation of the magnetization in a family of copper(II)/manganese(II) quasi-isotropic complexes with different ground spin states.

A family of copper(II)/manganese(II) new clusters with the formulas [CuNa(L2)(MeOH)(ClO)] (1), [CuII2Mn(,-L3)(MeOH)](ClO) (2SS), [{CuMn(L1)(HO)(MeOH)}{Cu(L1)}](ClO) (3), [(μ-N){CuMn(L2)(HO)}{Cu(L2)](ClO)} (4) and [(μ-N){CuMn(L1)(N)}{CuNa(L1)(MeOH)}](ClO) (5) with L1 = ,'-ethylene-bis(3-methoxysalicylaldiimine), L2 = ,'-ethylene-bis(3-ethoxysalicylaldiimine) and L3 = ,'-cyclohexane-bis(3-ethoxysalicylaldiimine), has been synthesized, and structurally and magnetically characterized. Reduced magnetization studies demonstrate that the magnetic anisotropy of the systems is very small. However, dynamic magnetic studies and ultra-low-frequency Raman spectroscopy confirm the slow relaxation of these systems despite their quasi-isotropic nature, enlarging the range of non-anisotropic slow relaxing molecules.

Slow magnetic relaxation for cobalt(II) complexes in axial bipyramidal environment: an = 1/2 spin case.

A new family of magnetically mononuclear cobalt(II) complexes with formula [{Ni(L)Co(HO)(MeOH)}{Ni(L)}](ClO) where HL1 = bis(,'-bis(3-methoxysalicylidene)ethylene-1,2-diamine) (1), HL2 = bis(,'-bis(3-methoxysalicylidene)propane-1,2-diamine) (2) and [{Cu(L4)}Co](ClO) (3) where HL4 = bis(,'-bis(3-ethoxysalicylidene)cyclohexane-1,2-diamine) have been obtained employing non chiral or enantiomerically pure Schiff bases. The structural studies have been carried out by single crystal X-ray and powder diffraction. Dynamic magnetic studies indicate that some members of this family present field induced slow relaxation of the magnetization and its response has been compared with the magnetically diluted [ZnCo] complex 1D.

Quasi-isotropic SMMs: slow relaxation of the magnetization in polynuclear Cu/Mn complexes.

Three field induced SMMs built from quasi-isotropic cations like Cu and Mn have been characterized, showing that relatively large clusters with quasi-negligible and different ground spin states, = 3/2, 2 or 4, can also exhibit field-induced slow relaxation of magnetization.