Coordination polymers with chelidonate (4-oxo-4H-pyran-2,6-dicarboxylate) anions and dmso: [Zn(chel)(dmso)2] and linkage isomers of [Co(chel)(dmso)(OH2)3]•H2O

Recrystallization from dmso of the previously prepared compound [Co(chel)(H2O)(4)] (chel = 4-oxo-4H-pyran-2,6-dicarboxylate), led to the new one-dimensional coordination polymers 1a and 1b, which are linkage isomers of formula [Co(chel)(dmso)(OH2)(3)]center dot H2O. Also the recrystallization from dmso of the previously prepared [Zn(chel)(H2O)(2)] allow the isolation of the one-dimensional coordination polymer [Zn(chel)(dmso)(2)] (2). [Co(chel)(H2O)(4)] was characterized by elemental analysis, IR and electronic spectroscopy, magnetic measurements at room temperature and thermogravimetric analysis. X-ray single crystal diffraction of 1a, 1b and 2 showed the coordinative behavior of the chelidonate ligand in each compound as well as the different participation of this ligand in the corresponding metallosupramolecular organization. (C) 2011 Elsevier B.V. All rights reserved.