Octahedral Co(III) complexes of 2-(phenylimino)pyrrolyl ligands: Synthesis and structural characterisation

• Tipo: Artigo em Revista Científica Internacional
• Data: 2011

Autores

Gomes, CSB (Autor) Outra; Sónia Carabineiro (Autor) FEUP; Gomes, PT (Autor) Outra; Duarte, MT (Autor) Outra; Lemos, MANDA (Autor) Outra

Revista

Título: Inorganica Chimica Acta

Vol. 367

Páginas: 151-157

ISSN: 0020-1693

Editora: Elsevier

Indexação

ISI Web of Knowledge - 9 Citações

Scopus - 7 Citações

Outras Informações

ID Authenticus: P-002-V25

DOI: 10.1016/j.ica.2010.12.032

Abstract (EN): The reactions of CoCl2 with three equivalents of 2-(phenylimino)pyrrolyl sodium salts, performed under a nitrogen atmosphere, lead to the formation of the Co(III) complexes [Co(kappa N-2,N'-NC4H3C(H)=N-C6H5)(3)] (2a), [Co(kappa N-2,N'-NC4H3C(CH3)=N-C6H5)(3)] (2b) and [Co(kappa N-2,N'-NC16H9C(H)=N-C6H5)(3)] (2c), accommodating three chelating iminopyrrolyl ligands. Complexes 2a-c were obtained in moderate yields, and their characterisation by H-1, C-13 NMR and X-ray diffraction show they are diamagnetic and have an octahedral geometry about the cobalt centre, respectively. Uncharacterised products were obtained in the same reaction involving ligand precursors such as 2-(2,6-dimethylphenylimino) pyrrolyl sodium salts, which is attributed to a greater steric hindrance in the coordination of three of these bulkier ligands. The redox behaviour of complexes 2a-c shows an irreversible reduction wave with a peak potential in the range -3.2 to -3.7 V. Upon reduction, the complexes decompose giving rise, in the case of 2a, to a redox pattern compatible with the formation of [Co(kappa N-2,N'-NC4H3C(H)=N-C6H5)(2)].

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 7