SYNTHESIS AND CRYSTAL-STRUCTURE OF THE DINUCLEAR COMPLEX OF HENYL-3'-METHYL-5'-PYRAZOLONE-4')-1,5-PENTANEDIONE WITH SAMARIUM

The dinuclear complexes of henyl-3'-methyl-5'-pyrazolone-4')-1,5-penta nedione (H(2)L) with samarium, Sm(2)L(3).7H(2)O (1) and Sm(2)L(3).5DMF (2), have been synthesized. The X-ray crystal structure of Sm(2)L(3). 5DMF has been determined. In complex 2, each L bonds two samarium atom s with its two beta-diketonate groups. The L acts as a bridging ligand . There are two DMF molecules bonded to each samarium atom. The coordi nation number of the two samarium atoms is eight (six oxygen atoms fro m three beta-diketonates and the other two oxygen atoms from two DMF c arbonyls). The eight atoms around the samarium make up a distorted squ are antiprism configuration. There are large differences between coord inated and uncoordinated DMF molecules.