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Magnetic relaxation of 1D coordination polymers (X)₂[Mn(acacen)Fe(CN)₆], X = Ph₄P⁺, Et₄N⁺
Michał Rams1, Eugenia V Peresypkina, Vladimir S Mironov
1Institute of Physics, Jagiellonian University , Reymonta 4, 30-059 Kraków, Poland.
Abstract:
Substitution of the organic cation X in the 1D polymer, (X)2[Mn(acacen)Fe(CN)6], leads to an essential change in magnetic behavior. Due to the presence of more voluminous Ph4P(+) cations, the polyanion has a more geometrically distorted chain skeleton and, as a consequence, enhanced single chain magnet (SCM) characteristics compared to those for Et4N(+). The Arrhenius relaxation energy barriers, the exchange interaction constant and the zero-field splitting anisotropy of Mn(III) are determined from the analysis of magnetic measurements. The discussion is supported with ligand field calculations for [Fe(CN)6](3-) that unveils the significant anisotropy of Fe magnetic moments.
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