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Title: 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
Author: Girginova, PI
Paz, FAA
Nogueira, HIS
Silva, NJO
Amaral, VS
Klinowski, J
Trindade, T
Keywords: Cobalt complexes
Crystal structures
3-Hydroxypicolinic acid
Magnetic properties
Issue Date: Mar-2005
Abstract: Two complexes with Co2+ and 3-hydroxypicolinic acid, [Co(picOH)2(H2O)2] (I) and mer-[N(CH3)4][Co(picOH)3] Æ 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.
Peer review: yes
DOI: 10.1016/j.poly.2005.01.002
ISSN: 0277-5387
Appears in Collections:DQ - Artigos

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