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

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Gomes, CSB (Author) Other; Sónia Carabineiro (Author) FEUP; Gomes, PT (Author) Other; Duarte, MT (Author) Other; Lemos, MANDA (Author) Other

Journal

Title: Inorganica Chimica Acta

Vol. 367

Pages: 151-157

ISSN: 0020-1693

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 9 Citations

Scopus - 7 Citations

Other information

Authenticus ID: 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)].

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 7