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Synthesis and Molecular Structures of Nickel( II ) and Cobalt( III ) Complexes with 2‐(Arylimino)‐3‐(hydroxyimino)butane
Author(s) -
Zangrando Ennio,
Trani Manuela,
Stabon Elisa,
Carfagna Carla,
Milani Barbara,
Mestroni Giovanni
Publication year - 2003
Publication title -
european journal of inorganic chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.667
H-Index - 136
eISSN - 1099-0682
pISSN - 1434-1948
DOI - 10.1002/ejic.200300030
Subject(s) - chemistry , aryl , chelation , nickel , steric effects , cobalt , medicinal chemistry , butane , stacking , hydrogen bond , stereochemistry , catalysis , polymer chemistry , organic chemistry , molecule , alkyl
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)