Nickel(II) derivatives of N-benzyliminodiacetate(2−) ligands, with and without imidazole: Synthesis, crystal structure and properties

• Published in: Polyhedron 2010-02, Vol.29 (2), p.683-690
• Main Authors: Patel, D.K., Choquesillo-Lazarte, D., González-Pérez, J.M., Domínguez-Martín, A., Matilla-Hernandez, A., Castiñeiras, A., Niclós-Gutiérrez, J.
• Format: Article
• Language: English
• Subjects: Crystal structure; Imidazole; Iminodiacetate; Nickel(II) complexes
• ISSN: 0277-5387
• DOI: 10.1016/j.poly.2009.09.034

The structures of the binary molecular compounds [Ni(Chel)(H 2O) 3]· nH 2O ( n = 0 or 1) and the salts [Ni(Him) 6][Ni(Chel) 2]·4H 2O are reported (Chel = N-( p-methylbenzyl) or N-( p-methoxybenzyl)iminodiacetate(2−) ligands; Him = imidazole). The ternary compounds [Ni(Chel)(Him) 3]· nH 2O were not obtained. These facts are related to the nature of the non-coordinating N-arm of Chel and the octahedral Ni(II) centre. In an attempt to prepare binary and ternary compounds, we have obtained two molecular complexes [Ni(MEBIDA or MOBIDA)(H 2O) 3]· nH 2O ( n = 0 or 1) and two iso-type salts [Ni(Him) 6][Ni(MEBIDA or MOBIDA) 2]·4H 2O [MEBIDA = N-( p-methylbenzyl)iminodiacetate(2−) and MOBIDA = N-( p-methoxybenzyl)iminodiacetate(2−) ligands, Him = imidazole]. Our results are discussed with regard to related copper(II) and nickel(II) compounds. The reasons for which these chelating ligands produce nickel(II) salts instead of ternary compounds remain unclear since other iminodiacetate-like ligands give true ternary Ni(II) compounds with imidazole and other N-heterocyclic ligands.