Self‐Assembled 1D Water Cluster in a Supramolecular Architecture of Co II (Tartrate)(Phenanthroline/Bipyridine): An Assessment of Magnetic Property

The coordination polymer, {[Co(tart)(phen)]·6H2O}n (1) (tart, tartrate dianion; phen, 1,10-phenanthroline) has been synthesized and characterized by single-crystal X-ray structure determination, magnetic measurement and thermal analysis. The structural analyses reveal two adjacent parallel 1D–[Co(phen)-tart-Co(phen)]– coordination polymers zipped through π-π interactions. The lattice water molecules, forming a 1D water cluster, function as glue to form a 3D supramolecular network through an extended hydrogen bonding. A comparison highlighting the structural differences with the corresponding 2,2′-bipyridine (bpy) derivative, {[Co(tart)(bpy)]·5H2O}n (2) containing a less amount of lattice water molecules is discussed. The variable-temperature magnetic study of 1 has been carried out and interpretation of the already reported complex 2 has been re-visited: both polymers 1 and 2 show weak antiferromagnetic interaction. (© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)