F. Marchetti, C. Pettinari, A. Cingolani, R. Pettinari, D. Leonesi, A. Drozdov, S. Troyanov,
XX Congresso Nazionale della Societa chimica italiana, Rimini, 4-9 giugno 2000, Atti, v. II, p. IN-PO050.
Absract. In recent years there is a growing interest in the co-ordination chemistry of 4-acyl-5-pyrazolonate O2-donor ligands, as efficient carriers in the liquid membrane permeation of M2+ metal ions and for photoluminescence and electroluminescence features of their lanthanide derivatives, as promising candidate for new generation low-cost, full-colour, flat-panel displays. We have recently provided detailed insight into structural aspects and chemical behaviour of several alkali-metal acylpyrazolonato systems. Here we extend our study on the interaction of these donors toward zinc(II) and cadmium(II) acceptors in the presence of several mono- and bidentate ancillary ligands. Hydrated or solvated bis(acylpyrazolonate)metal derivatives can be readily obtained, which are stabilized in the solid state by extensive intermolecular H-bonding. Aliphatic and aromatic N2-donors afford six-co-ordinate mononuclear compounds whereas dinuclear derivatives are stabilised by 1-methylimidazolin-2-thione, co-ordinated in a bridging fashion.
Coordination Chemistry Laboratory