Mono- and di-nuclear nickel(II) complexes with Schiff bases derived from 4-substituted 2,6-diformylphenol and 7-amino-4-methyl-5-azahept-3-en-2-one; Crystal and molecular structure of [4-chloro-2,6-bis(4-methyl-2-oxo-5,8-diazanona-3,8-dienyl)phenolato(3-)] dinickel(II) bromide hemihydrate

Article abstract of DOI:10.1039/DT9900003063

The reaction of 4-chloro- or 4-methyl-2,6-diformylphenol with 7-amino-4-methyl-5-azahept-3-en-2-one leads to either quadridentate mononucleating or heptadentate binucleating Schiff-base ligands, depending on the reaction conditions. Nickel complexes with both types of ligands have been obtained and characterized by i.r., u.v.-visible, n.m.r., and mass spectrometry. An interesting example of impeded pseudo-rotation of a five-membered chelate ring in dinuclear nickel complexes is observed. The single-crystal X-ray structure of [4-chloro-2,6-bis(4-methyl-2-oxo-5,8-diazanona-3,8-dienyl)phenolato(3-)] dinickel(II) bromide hemihydrate has been determined. It consists of a dinuclear complex cation of twisted bifurcated shape and a bromide anion, with a half-equivalent of water incorporated into the crystal lattice. Crystallographic data: space group C2/c (no. 15), a = 22.082(4), b = 11.5, c = 22.368(4) A, β = 118.61 (1)°, R and R′ 0.0380 and 0.0318, respectively.

Full text of DOI:10.1039/DT9900003063

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