Tin(IV) and organotin(IV) derivatives containing a novel class of bis beta-diketonato ligands

C. Pettinari, F. Marchetti, A. Cingolani, R. Pettinari, C. Santini, A. Drozdov, S. Troyanov

XX Congresso Nazionale della Societa chimica italiana, Rimini, 4-9 giugno 2000, Atti, v. II, p. IN-O-PO018.

Abstract. We have recently undertaken a systematic study on the co-ordination ability of bis(4acyl-5-pyrazolones), toward tin(IV) and organotin(IV) asseptors. These represent an interesting family of powerful chelating O₄-donor ligands which have been widely employed for they solvent extraction properties toward several first row transition M²⁺ ions and for the excellent fluorescence properties of their lanthanide metal compounds. In this communication we show how the X group between the -diketonato units can strongly influence the nuclearity and stereochemistry of tin compounds. In fact, when X = -CH₂CH₂- or 1,3-C₆H₄-, dinuclear six-co-ordinate tin derivatives afforded. When X = 1,2-C₆H₄-, complexes are mononuclear with five-co-ordinate tin centre, whereas for X = 1,4-C₆H₄- polynuclear derivatives are assumed, base on their insolubility in most of solvents.

Coordination Chemistry Laboratory