Abstract
Four Zn/Dy heteronuclear SMMs constructed from hexadentate compartment Schiff base Zn-precursor and lanthanide ions were structurally and magnetically characterized, in which two [Zn-Dy] moieties are bridged by series of hydroxamic acid and resulting in double deck tetranuclear complexes with the molecular formulae [ZnL1Dy(HO)(pyz)]2⋅2CF3O3S⋅2H2O (1), [ZnL1Dy(CH3O)(aca)]2⋅2CF3O3S⋅2CH3OH (2), [ZnL2Dy(CH3O)(pyz)]2⋅2CF3O3S⋅2CH3OH (3) and [ZnL2Dy(CH3O)(pyi)]2⋅2CF3O3S⋅4CH3OH (4) (L1 = N,N′-bis(salicylidene)ethylenediimine, L2 = N,N′-bis(3-methoxysalicylidene)phenylene-1,2-diamine pyz = pyrazinehydroxamic acid, aca = acetohydroxamic acid and pyi = pyridiniumhydroxamic acid). The SMM properties were successfully modulated by introducing electron-donation or -withdrawing terminal on the hydroxamic acid. Complexes 1-4 showed significant zero-field SMM behavior with energy barriers 81 K to 92 K.
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