Zinc and cadmium bis(acylpyrazolonato) derivatives containing additional ancillary donors. Solution and solid state characterization and reactivity

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