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Synthesis and Molecular Structures of Nickel(II) and Cobalt(III) Complexes with 2-(Arylimino)-3-(hydroxyimino)butane

✍ Scribed by Ennio Zangrando; Manuela Trani; Elisa Stabon; Carla Carfagna; Barbara Milani; Giovanni Mestroni

Publisher: John Wiley and Sons
Year: 2003
Tongue: English
Weight: 219 KB
Volume: 2003
Category: Article
ISSN: 1434-1948
DOI: 10.1002/ejic.200300030

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✦ Synopsis

Abstract

We report new series of Ni^II^ and Co^III^ complexes with nitrogen‐donor chelating ligands of the (E,E)‐2‐(arylimino)‐3‐(hydroxyimino)butane type (Ar−N^∩^N−OH). These ligands are characterized by a hydrophilic (OH group) and a hydrophobic region (aryl group). Ni^II^ derivatives were obtained either as trimers of formula [Ni~3~(Ar−N^∩^N−OH)~3~Br~4~(OH)][Br], with the hydrophobic groups oriented on the same side, or as bis(chelated) derivatives with cis geometry, depending on the steric hindrance of the aryl groups. Co^III^ complexes were obtained only as bis(chelated) derivatives, with the two ligands coplanar. The “iso‐oriented” arrangement of ligands in bis(chelated) Co^III^ complexes is favored by weak interactions between the two ligands, namely O−H**···**O hydrogen bond and stacking interactions between the aryl groups. Co^III^ complexes might find application as catalysts for living or controlled radical polymerization of polar olefins, and preliminary results are reported. (© Wiley‐VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2003)

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