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Fine Tuning the Energy Barrier of Molecular Nanomagnets via Lattice Solvent Molecules.

Sci Rep; 7(1): 15483, 2017 Nov 14.
Artigo em Inglês | MEDLINE | ID: mdl-29138465
Solvents play important roles in our lives, they are also of interest in molecular materials, especially for molecular magnets. The solvatomagnetic effect is generally used for trigger and/or regulation of magnetic properties in molecule-based systems, however, molecular nanomagnets showing solvatomagnetic effects are very difficult to obtain. Here we report four 3d-4f heterometallic cluster complexes containing ROH lattice solvent molecules, [CuTb(HL)(OAc)(hfac)]∙2ROH {HL = 1,3-Bis[tris(hydroxymethyl)methylamino]propane, hfac = hexafluoroacetylacetonate; R = CH, 1; R = CH, 2; R = CH, 3; R = H, 4}. Single-molecule magnet (SMM) properties of these four complexes were observed to be dependent on the ROH lattice solvent molecule. There is an interesting magneto-structural correlation: the larger the R group, the higher the energy barrier. For the first time, the solvatomagnetic effect is used for the continuous fine adjustment of the energy barrier of 0D molecular nanomagnets. Additionally, [CuDy(HL)(OAc)(hfac)]∙2MeOH (5), an analogue of [CuTb(HL)(OAc)(hfac)]∙2MeOH (1), is also reported for comparison.