Synthesis, characterisation and magnetic properties of cobalt(II) complexes with picolinic acid derivatives: The crystal and molecular structures of [Co(MeC<inf>5</inf>H<inf>3</inf>NCOO)<inf>2</inf>(H<inf>2</inf>O) <inf>2</inf>] and [CoCl<inf>2</inf>(C<inf>5</inf>H<inf>4</inf>NCOOPr <sup>i</sup>)<inf>2</inf>]

Ricard March, William Clegg, Robert A. Coxall, Lourdes Cucurull-Sánchez, Luis Lezama, Teófilo Rojo, Pilar González-Duarte

Research output: Contribution to journalArticleResearchpeer-review

60 Citations (Scopus)

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.
Original languageEnglish
Pages (from-to)129-138
JournalInorganica Chimica Acta
Volume353
DOIs
Publication statusPublished - 8 Sep 2003

Keywords

  • Antiferromagnetic interaction
  • Cobalt complexes
  • Crystal structures
  • Picolinate ligand

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