科研之友
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摘要
Five tetranuclear complexes with the composition of [M-4(L)(4)(mu(3)-OMe)(4)(MeOH)(4)], (M = Ni (1) or Co (2), HL is 3,5-dichloro-2-hydroxy-benzaldehyde (Hdchb); M = Ni (3) or Co (4), HL is 2-hydroxy-3-methoxybenzaldehyde (Hhmb); M = Ni (5), HL is 5-bromo-2-hydroxy-benzaldehyde (Hbhb)), were prepared by reaction of salt perchloride hexahydrate with 2-hydroxy-benzaldehyde ramification under solvothermal conditions. All compounds were characterized by elemental analysis, IR spectroscopy and X-ray single-crystal diffraction. Compounds 1-5 have tetranuclear clusters with a cubane topology in which the metal ions and the oxygen atoms from the methanol ligands occupying the alternate vertices of the cubane. The {M4O4} cores display dominant ferromagnetic interactions from the nature of the binding modes through mu(3)-OCH3 . No single-molecule magnets (SMMs) behaviors have been observed in complexes 1-3 and 5. In contrast, compound 4 has been observed obviously slow relaxation for the S-4 site symmetry and exhibits the behavior of SMMs. The results further support that judicious choice of harmonious mixed ligands provides the means to create a rich variety of new isolated individual {M4O4} cubic system and allows a systematic magnetic study of the effect of intermolecular interactions and correlation.
