Synthesis and magnetic properties of polymeric complexes containing ruthenium(II)-ruthenium(III) tetracarboxylato units linked by cyanato, thiocyanato, and selenocyanato ligands

Polymeric complexes of ruthenium(II)-ruthenium(III) tetracarboxylato units linked by cyanato, thiocyanato, and selenocyanato ligands [Ru-2{O2C(CH2)(m)CH3}(4)(L)] (n) (m = 0, 4-7; L = OCN-, SCN-, and SeCN-) were prepared and characterized based on the elemental analyses, IR, and diffuse reflectance spectra. Magnetic susceptibilities were measured at the temperature range of 4.5 K to 300 K, where the interdimer antiferromagnetic interactions were revealed. The strongest interaction was exhibited in case of m = 7 and L = OCN-. H-1-NMR spectra of [Ru{O2C(CH2)(7)CH3}(4)(SCN)] (n) in CD2Cl2 showed broad signals which can be ascribed to polymeric species, as the addition of tetrabutylammonium thiocyanate caused sharper signals due to the formation of [Ru-2{O2C(CH2)(7)CH3}(4)(SCN)(2)](-) adduct as the main species in the solution. (C) 2008 Institute of Chemistry, Slovak Academy of Sciences.