Strategy for the Rational Design of Asymmetric Triply Bridged Dinuclear 3d-4f Single-Molecule Magnets

Three triply bridged MII-DyIII dinuclear complexes, [Ni(μ-L)(μ-OAc)Dy(NO3)2] 1, [Zn(μ-L)(μ-OAc)Dy(NO3)2] 2, and [Ni(μ-L)(μ-NO3)Dy(NO3)2]·2CH3OH 3 were prepared with a new and flexible compartmental ligand, N,N′,N″-trimethyl-N,N″-bis(2-hydroxy-3-methoxy-5-methylbenzyl)diethylene triamine (H2L), conta...

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Published in:Inorganic chemistry 2011-08, Vol.50 (15), p.7268-7273
Main Authors: Colacio, Enrique, Ruiz-Sanchez, José, White, Fraser J, Brechin, Euan K
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Language:English
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container_end_page 7273
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container_title Inorganic chemistry
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creator Colacio, Enrique
Ruiz-Sanchez, José
White, Fraser J
Brechin, Euan K
description Three triply bridged MII-DyIII dinuclear complexes, [Ni(μ-L)(μ-OAc)Dy(NO3)2] 1, [Zn(μ-L)(μ-OAc)Dy(NO3)2] 2, and [Ni(μ-L)(μ-NO3)Dy(NO3)2]·2CH3OH 3 were prepared with a new and flexible compartmental ligand, N,N′,N″-trimethyl-N,N″-bis(2-hydroxy-3-methoxy-5-methylbenzyl)diethylene triamine (H2L), containing N3O2-inner and O4-outer coordination sites. These complexes have diphenoxo/acetate (1 and 2) or diphenoxo/nitrate (3) asymmetric bridging fragments. Compounds 1 and 3 exhibit ferromagnetic interaction between Ni2+ and Dy3+ ions and frequency dependence of the out-of-phase (χ″M) alternating current (ac) susceptibility signal characteristic of single-molecule-magnet behavior. The energy barriers Δ/k B for compound 3 under zero and 1000 Oe applied direct current (dc) magnetic fields were estimated from the Arrhenius plots to be 7.6 and 19.1 K, respectively.
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title Strategy for the Rational Design of Asymmetric Triply Bridged Dinuclear 3d-4f Single-Molecule Magnets
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