TY - JOUR
T1 - Synthesis, characterisation and magnetic properties of cobalt(II) complexes with picolinic acid derivatives: The crystal and molecular structures of [Co(MeC5H3NCOO)2(H2O) 2] and [CoCl2(C5H4NCOOPr i)2]
AU - March, Ricard
AU - Clegg, William
AU - Coxall, Robert A.
AU - Cucurull-Sánchez, Lourdes
AU - Lezama, Luis
AU - Rojo, Teófilo
AU - González-Duarte, Pilar
PY - 2003/9/8
Y1 - 2003/9/8
N2 - The reaction of Co(AcO)2 with 6-methyl-2-pyridinecarboxylic acid, and that of CoCl2 with the isopropyl ester of 2-pyridinecarboxylic acid, both with a 1:2 metal to ligand molar ratio, afford optimum yields for the synthesis of cis-[Co(MeC5H 3NCOO)2(H2O)2] and cis-[CoCl 2(C5H4NCOOPri)2], respectively. According to X-ray crystallography they both consist of mononuclear discrete molecules with octahedral coordination around Co(II). The ESR powder spectra of the related Zn phases doped with 0.25% Co(II) show the strong anisotropy of the g and A tensors. The magnetic behaviour of the solid complexes is characteristic of Co(II) systems with important spin-orbit coupling and weak antiferromagnetic interactions. Electronic UV-Vis and magnetic data indicate that these complexes, as well as the already known trans-[Co(C5H4NCOO)2(H2O) 2], have a high-spin octahedral geometry in solution. © 2003 Elsevier B.V. All rights reserved.
AB - The reaction of Co(AcO)2 with 6-methyl-2-pyridinecarboxylic acid, and that of CoCl2 with the isopropyl ester of 2-pyridinecarboxylic acid, both with a 1:2 metal to ligand molar ratio, afford optimum yields for the synthesis of cis-[Co(MeC5H 3NCOO)2(H2O)2] and cis-[CoCl 2(C5H4NCOOPri)2], respectively. According to X-ray crystallography they both consist of mononuclear discrete molecules with octahedral coordination around Co(II). The ESR powder spectra of the related Zn phases doped with 0.25% Co(II) show the strong anisotropy of the g and A tensors. The magnetic behaviour of the solid complexes is characteristic of Co(II) systems with important spin-orbit coupling and weak antiferromagnetic interactions. Electronic UV-Vis and magnetic data indicate that these complexes, as well as the already known trans-[Co(C5H4NCOO)2(H2O) 2], have a high-spin octahedral geometry in solution. © 2003 Elsevier B.V. All rights reserved.
KW - Antiferromagnetic interaction
KW - Cobalt complexes
KW - Crystal structures
KW - Picolinate ligand
U2 - 10.1016/S0020-1693(03)00243-3
DO - 10.1016/S0020-1693(03)00243-3
M3 - Article
SN - 0020-1693
VL - 353
SP - 129
EP - 138
JO - Inorganica Chimica Acta
JF - Inorganica Chimica Acta
ER -