Two complexes with Co2+and 3-hydroxypicolinic acid, [Co(picOH)2(H2O)2] (I) and mer-[N(CH3)4][Co(picOH)3]·H2O (II), have been synthesised and characterised using single-crystal X-ray diffraction, elemental analysis, infrared spectroscopy, and thermoanalytical measurements. The 3-hydroxypicolinate ligands are coordinated to the Co2+centres via its typical N,O-chelating coordination fashion. While in I the presence of two coordinated water molecules leads to the formation of a neutral [Co(picOH)2(H2O)2] complex which is strongly hydrogen bonded to another four neighbouring complexes, in II the inclusion of a third picOH-ligand leads to an anionic octahedral complex, [Co(picOH)3]-, in which all the N- and O-atoms are occupying mer positions. The properties of these two compounds were further investigated by measuring their magnetic behaviour. © 2005 Elsevier Ltd. All rights reserved.
Girginova, P. I., Almeida Paz, F. A., Nogueira, H. I. S., Silva, N. J. O., Amaral, V. S., Klinowski, J., & Trindade, T. (2005). Synthesis, characterisation and magnetic properties of cobalt (II) complexes with 3-hydroxypicolinic acid (HpicOH): [Co(picOH)2(H2O)2] and mer-[N(CH3)4][Co(picOH)3]·H2O. Polyhedron, 24(4), 563–569. https://doi.org/10.1016/j.poly.2005.01.002