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Mandatory Fields
Houton, E; Taylor, S. M; Beedle, C. C; Cano, J; Piligkos, S; Hill, S; Ryder, A. G; Brechin, E. K.; and Jones L. F;
2012
April
Dalton Transactions
Ferromagnetic exchange in a twisted, oxime-bridged [MnIII2] dimer.
Published
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41
27
8340
8347
The dimeric complex [MnIII 2(Naphth-sao)2(Naphth-saoH)2(MeOH)2]·4MeOH (1·4MeOH), acts as a simple model complex with which to examine the magneto-structural relationship in polymetallic,oxime-bridged MnIII complexes. Dc magnetic susceptibility studies reveal that ferromagnetic exchangeis mediated through the heavily twisted Mn–O–N–Mn moiety (J = +1.24 cm−1) with magnetisation measurements at low temperatures and high fields suggesting significant anisotropy. Simulations of highfield, high frequency EPR data reveal a single ion anisotropy, D(MnIII) = −3.94 cm−1. Theoretical studies on simplified model complexes of 1 reveal that calculated values of the exchange coupling and the anisotropy are in excellent agreement with experiment, with the weak ferromagnetism resulting from an accidental orthogonality between the Mn–N–O plane of the first MnIII ion and the Jahn–Teller axis of the second MnIII ion.
http://dx.doi.org/10.1039/C2DT30674C
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