Synthesis,characterization of an unusual crystalline material with tartrate

An exploration of the cobalt‐tartrate system under hydrothermal conditions, has led to the isolation of crystalline framework {Co₂(H₂tar)₂]·2H₂O}_n ( 1 ) (H₂tar = tartrate dianion). Single‐crystal X‐ray analyses reveal that it crystallizes in the orthorhombic space group P2₁2₁2. a = 11.0924(11) Å, b = 7.8517(8) Å, c = 9.0171(9) Å, β = 90°. A dinuclear Co^II unit is formed via two different coordinated tartrate molecules. Further these units are united together through two bridging carboxylate groups of hexa‐coordinated H₂tar ligands to form a 2D grid layer, which exhibits a typical (6,3) topological network. (© 2008 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)