| Abstract |
Four novel heterometallic complexes [Co(2)Cr(2)(NCS)(4)(HDea)(2)(Dea)(2)]center dot 4dmf (1), [Co(2)Cr(2)(NCS)(4)(HDea)(2)-(Dea)(2)]center dot 4dmso (2), [Mn(2)Cr(2)(NCS)(4)(HDea)(2)(Dea)(2)(dmf)(2)]center dot 2dmf (3) and [Mn(2)Cr(2)(NCS)(4)(HDea)(2)(Dea)(2)(dmso)(2)]center dot 4dmso (4) have been prepared using zerovalent cobalt (1, 2) or manganese (3, 4), Reineckes salt, ammonium thiocyanate and a non-aqueous solution of diethanolamine (H(2)Dea) in air. The single X-ray analysis reveals that all compounds have similar centrosymmetric crystal structures based on a tetranuclear \M(2)Cr(2)(mu(3)-O)(2)(mu-O)(4)\ (M = Co, Mn) core. Variable-temperature magnetic susceptibility measurements of 1, 2 and 4 show antiferromagnetic coupling between the magnetic centers, while 3 exhibits a ferromagnetic behavior. (C) 2010 Elsevier Ltd. All rights reserved. |
