Chelating properties of new series of heterocyclichydrazones. X-ray crystallography and mass spectrometry of their metal complexes

The chelating properties of a new series of alpha:-N-heterocyclichydrazones (heterocycle = substituted quinoline, benzothiazole, phthalazine) have bee n studied. Nickel complexes have been synthesized and structurally characte rized in the gas phase by mass spectrometry and tandem mass spectrometry, a nd in the solid state by x-ray crystallography. Each ligand (LH) acts as tr identate and it undergoes a deprotonation in the complex formation. The com plexes are neutral species and they can be formulated as [ML2]. The crystal structure of bis[N-(2-benzothiazolyl)-N'-(methlymethoxycarbonyl)hydrazine] nickel(II) x 0.5 H2O has been determined. The metal shows a pseudo-octahedr al polyhedron and it is coordinated to two nitrogen and to oxygen atoms in the equatorial plane, and to two hydrazone nitrogen atoms in the axial posi tions. (C) 1998 Elsevier Science Ltd. All rights reserved.