Synthesis, Structure, Magnetic and Photoluminescent Properties of Dysprosium(III) Schiff Base Single-Molecule Magnets: Investigation of the Relaxation of the Magnetization.

摘要: We report here the synthesis, structure, magnetic and photoluminescent properties of three new bifunctional Schiff-base complexes [Dy(L1 )2 (py)2 ][B(Ph)4 ]⋅py (1), Cl(DME)] ⋅ 0.5DME (2) [Dy(L2 Cl] ⋅ 2.5(C7 H8 ) (3) (HL1 =Phenol, 2,4-bis(1,1-dimethylethyl)-6-[[(2-methoxy-5-methylphenyl)imino]methyl]; HL2 2,4-bis(1,1-dimethylethyl)-6-[[(2-methoxyphenyl)imino]methyl]). The coordination environment Dy3+ ion direction anisotropic axis may be controlled by combination substituent groups Schiff bases, nature counter-ions (Cl- vs. BPh4- coordinative solvent molecules. A zero-field slow relaxation magnetization is evidenced for all but strong differences in dynamics are observed depending on site geometry. In this sense, complex 1 exhibits an anisotropy barrier 472 cm-1, which favourably compared to other related examples due shortening Dy-O bond axial direction. Besides, exhibit a ligand-based luminescence making them as magneto-luminescent systems.