Journal
ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE
Volume 630, Issue 4, Pages 597-603Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/zaac.200300409
Keywords
Schiff bases; nickel; macrocyclic complex; X-ray powder diffraction; NMR spectroscopy
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Six new nickel(II) complexes of the unsymmetrical Schiff base ligands derived from o-phenylenediamne were synthesized. These complexes were prepared by template and non-template reactions of the precursor 3-acetyl-4-[N-(2'-aminophenyl)-amino]-3-buten-2-one (HLdegrees) with appropriate o-hydroxycarbonyl aromatic compounds, aromatic 1,3-oxo aldehydes and 1,3-diketones. The nickel(II) compounds were characterized by analytical and spectroscopic methods. Crystal structure of complex [3-acetyl-(6,7)-benzo-8-salicylidene-5,8-diazahepta-3-ene-2-onato(2-)]nickel(II) (NiL1) has been determined by X-ray powder diffraction method, revealed that the molecules are almost flat, and there are no forces other than van der Waals interactions between molecules. The structure was solved by global optimisation technique and refined by the Rietveld method, obtained R-F and R-wp are 11.6 and 17.4%, respectively. The synthesis of a new unsymmetrical nickel(II) tetraazamacrocyclic complex is also described.
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