Magnetic and theoretical characterization of a ferromagnetic Mn(III) dimer |
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| Institution: | 1. Instituto de Química – Universidade Federal Fluminense, Niterói, Rio de Janeiro, Brazil;2. Instituto de Ciências Exatas, Departamento de Química, Universidade Federal Rural do Rio de Janeiro, Seropédica, Rio de Janeiro, Brazil |
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| Abstract: | Reaction of 1,1,1-tris(hydroxymethyl)ethane (H3thme) with the complex Mn2O2(bpy)4](ClO4)3 produces the dimeric species Mn2(Hthme)2(bpy)2](ClO4)2 in high yield. Magnetic measurements in the temperature range 1.8–300 K and in fields up to 7 T reveal weak ferromagnetic exchange between the metal centres with J = +2.13 cm?1. A fit of the magnetization data, assuming only the ground state is populated, gives S = 4, g = 1.71 and D = ?0.65 cm?1. Low temperature single crystal measurements suggest the co-existence of SMM behaviour and strong intermolecular interactions. Density functional calculations also support a weak exchange interaction between the Mn ions. |
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