SYNTHESIS, STRUCTURE AND PROPERTIES OF LANTHANIDE(III) PICRATE COMPLEXES WITH TRANS-1,4-DITHIANE-1,4-DIOXIDE (TDTD)

A series of isomorphous lanthanide complexes, having general formula M (PiC)3(TDTD)1.5 (M=Ce-Er, Yb and Y), was synthesized and characterized by microanalyses, infrared spectra and visible emission spectrum for the Eu complex. Crystal structures were determined for the Ce and Eu d erivatives; for the other complexes only cell parameters were obtained and reported. The compounds crystallize with a monoclinic cell, space group P2(1)/c with Z=4. The metal ions are nine-coordinated with a tr icapped trigonal prismatic coordination polyhedron, achieved via the b onding of three bidentate picrate units and three oxygens of the TDTD ligands. The TDTD moieties are shared by adjacent metal centers, formi ng three-dimensional polymers.