J. Phys. IV France 114 (2004) 625
DOI: 10.1051/jp4:2004114148

A two-dimensional magnetic architecture with bridging polynitrile and 2,2 -bipyrimidine ligands

J.-R. Galán-Mascarós¹, F. Thétiot², S. Triki², J. Sala Pala² and K.R. Dunbar<sup>3

1</sup>  Instituto de Ciencia Molecular, Universidad de Valencia, Dr. Moliner 50, 46100 Burjasot, Spain
²  UMR CNRS 6521, Laboratoire de Chimie, Électrochimie Moléculaires et Chimie Analytique, Université de Bretagne Occidentale, BP. 809, 29285 Brest Cedex, France
³  Department of Chemistry, Texas A&M University, College Station, TX 77842-3012, USA

Abstract
A new polymeric, two-dimensional compound [ Co ₂(bpym)(dcne) ₄(H ₂O) ₂] (1) (dcne ^- = [ (CN) ₂CC(O)OEt)] ^- = 2,2-dicyano-1-ethoxyethenolate anion and bpym = 2,2' bipyrimidine) has been synthesized and characterized by X-ray crystallography. The structure is monoclinic space group P2 ₁/ a and consists of two-dimensional networks of octahedrally co-ordinated Co(II) ions, bridged by bis-bidentate 2,2'-bipyrimidine and -dcne anions. Magnetic measurements revealed a broad maximum in the _m vs T plot at 20 K which is characteristic of antiferromagnetic exchange between the high spin cobalt(II) centres. Key words. Cobalt complexes, magnetic measurements, 2.2'-bipyrimidine.

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