Title |
Ferromagnetic exchange in a twisted, oxime -bridged [Mn III 2 ] dimer
|
---|---|
Published in |
Dalton Transactions: An International Journal of Inorganic Chemistry, May 2012
|
DOI | 10.1039/c2dt30674c |
Pubmed ID | |
Authors |
Edel Houton, Stephanie M. Taylor, Christopher C. Beedle, Joan Cano, Stergios Piligkos, Stephen Hill, Alan G. Ryder, Euan K. Brechin, Leigh F. Jones |
Abstract |
The dimeric complex [Mn(III)(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 Mn(III) complexes. Dc magnetic susceptibility studies reveal that ferromagnetic exchange is 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 high field, high frequency EPR data reveal a single ion anisotropy, D((Mn(III))) = -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 Mn(III) ion and the Jahn-Teller axis of the second Mn(III) ion. |
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