Wednesday, November 28, 2012

1211.6288 (A. S. Markosyan et al.)

Exchange Interactions in a Dinuclear Manganese (II) Complex with
Cyanopyridine-N-oxide Bridging Ligands

A. S. Markosyan, I. Yu. Gaidukova, A. V. Ruchkina, A. O. Anokhin, V. Yu. Irkhin, N. P. Kuz'mina, V. N. Nikiforov
The oligonuclear manganese complex [Mn(hfa)2cpo]2 (where hfa is hexafluoroacetylacetonate dehydrate and cpo is 4-cyanopyridine-N-oxide) was synthesized, and its magnetic properties were characterized. The structure of the complex consists of centrosymmetric discrete [Mn(hfa)2(cpo)]2 binuclear entities with two Mn(II) ions being double-bridged by oxygen atoms of the cpo ligands. In the unit cell, the dinuclear molecules are well isolated from each other. The thermodynamic behavior of pure cpo and [Mn(hfa)2(cpo)]2 was simulated numerically in a dimer approximation by using an extrapolation to spin S = 5/2. The Mn-Mn exchange integral was evaluated.
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