New Multidimensional Coordination Polymers with μ 2 ‐ and μ 3 ‐dcno Cyano Carbanion Ligand {dcno – = [(NC) 2 CC(O)O(CH 2 ) 2 OH] – }

New polymeric materials [M(dcno) 2 (H 2 O) 2 ] [M = Fe II ( 1 ), Co II ( 2 )] and [M(dcno) 2 ] [M = Cu II ( 3 ), Mn II ( 4 )] with dcno – =[(NC) 2 CC(O)O(CH 2 ) 2 OH] – = 2,2‐dicyano‐1‐(2‐hydroxyethoxy)ethenolate anion have been synthesised and characterised by IR spectroscopy, X‐ray crystallography and magnetic measurements. In compounds 1 and 2 , each organic ligand acts in a bridging mode with its two nitrogen atoms bound to two different metal ions, while in compounds 3 and 4 , each organic anion acts as a μ 3 ‐bridging ligand through its two nitrogen atoms and the oxygen atom of the OH group. Each metal ion has a pseudo‐octahedral trans ‐MN 4 O 2 environment with four nitrogen atoms from four different organic ligands and two oxygen atoms from two water molecules in compounds 1 and 2 and from the OH group of the cyanocarbanion ligand in compounds 3 and 4 . These coordination modes give rise to 1D, 2D and 3D arrangements for compounds 1 , 2 and 3 – 4 , respectively. Magnetic measurements show weak antiferromagnetic coupling between metal centres in the four compounds.(© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)