ISOMERISM IN THE ADDUCT OF ORO-1-(2-NAPHTHYL)-1,3-BUTANEDIONATO)EUROPIUM(III) WITH DIPYRIDYL

The title compound (conveniently abbreviated Eu(TAN)(3).dipy) has been crystallized from a chloroform/2-propanol solvent mixture to give two different forms. These have been characterized by luminescence spectr oscopy and by X-ray diffraction. The two forms have different coordina tion polyhedra which means that they are structural isomers. One of th em is best described as bicapped trigonal prismatic and the other, whi ch contains two slightly different molecules, as square antiprismatic. (C) 1998 Elsevier Science S.A.