J. Phys. IV France 114 (2004) 625
A two-dimensional magnetic architecture with bridging polynitrile and 2,2 -bipyrimidine ligandsJ.-R. Galán-Mascarós1, F. Thétiot2, S. Triki2, J. Sala Pala2 and K.R. Dunbar3
1 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
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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