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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(C₅H₄NCOOPrⁱ)₂]

Lookup NU author(s): Professor William Clegg

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Abstract

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.

Publication metadata

Author(s): March R, Clegg W, Coxall RA, Cucurull-Sanchez L, Lezama L, Rojo T, Gonzalez-Duarte P

Publication type: Article

Publication status: Published

Journal: Inorganica Chimica Acta

Year: 2003

Volume: 353

Pages: 129-138

ISSN (print): 0020-1693

ISSN (electronic): 1873-3255

Publisher: Elsevier BV

URL: http://dx.doi.org/10.1016/S0020-1693(03)00243-3

DOI: 10.1016/S0020-1693(03)00243-3

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