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)] center dot H2O
authors Girginova, PI; Paz, FAA; Nogueira, HIS; Silva, NJO; Amaral, VS; Klinowski, J; Trindade, T
nationality International
journal POLYHEDRON
author keywords cobalt complexes; crystal structures; 3-hydroxypicolinic acid; magnetic properties
keywords CRYSTAL-STRUCTURES; 2-HYDROXYNICOTINIC ACID; MOLECULAR-STRUCTURES; COORDINATION MODES; LIGAND
abstract Two complexes with Co2+ and 3-hydroxypicolinic acid, [Co(picOH)(2)(H2O)(2)] (I) and mer-[N(CH3)(4)][Co(picOH)(3)] center dot 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. (c) 2005 Elsevier Ltd. All rights reserved.
publisher PERGAMON-ELSEVIER SCIENCE LTD
issn 0277-5387
year published 2005
volume 24
issue 4
beginning page 563
ending page 569
digital object identifier (doi) 10.1016/j.poly.2005.01.002
web of science category Chemistry, Inorganic & Nuclear; Crystallography
subject category Chemistry; Crystallography
unique article identifier WOS:000227571000013
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