Construction of Co(II) coordination polymers with flexible carboxylate ligands: structural and magnetic studies

Two Co(II) coordination polymers [Co(3-pmna)2(H2O)2]n (1) and {[Co2(4-pmna)4(H2O)]∙0.25H2O}n (2), where 3-Hpmna = 2-(3-pyridylmethylthio)nicotinic acid and 4-Hpmna = 2-(4-pyridylmethylthio)nicotinic acid, were synthesized and fully characterized. 1 displays chain structure, while 2 exhibits 3D coordination network composed of dimer units. Magnetic studies reveal spin-canting behaviors in 1.