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

Makoto Handa, Hideaki Ishida, Kayoko Ito, Toshihiro Adachi, Takahisa Ikeue, Ichiro Hiromitsu, Masahiro Mikuriya, and Kuninobu Kasuga

Department of Material Science, Interdisciplinary Faculty of Science and Engineering, Shimane University, Matsue 690-8504, Japan

 

E-mail: handam@riko.shimane-u.ac.jp

Received: 29 October 2007  Revised: 30 December 2007  Accepted: 10 January 2008

Abstract: Polymeric complexes of ruthenium(II)-ruthenium(III) tetracarboxylato units linked by cyanato, thiocyanato, and selenocyanato ligands [Ru2{O2C(CH2)mCH3}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. 1H-NMR spectra of [Ru{O2C(CH2)7CH3}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 [Ru2{O2C(CH2)7CH3}4(SCN)2] adduct as the main species in the solution.

Keywords: polymeric complexes - ruthenium(II)-ruthenium(III) - tetracarboxylate - alkyl chains - cyanate - magnetic properties

Full paper is available at www.springerlink.com.

DOI: 10.2478/s11696-008-0049-4

 

Chemical Papers 62 (4) 410–416 (2008)

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