SYNTHESIS AND CHARACTERIZATION OF MIXED-LIGAND 1,3-DITHIOLE-2-THIONE-4,5-DITHIOLATE AND 1,10-PHENANTHROLINE COMPLEXES OF LANTHANIDE CHLORIDE AND THEIR IODINATED MATERIALS

The lanthanide complexes of general formula K-2[Ln(dmit)(phen)(2)Cl-3] . 6H(2)O (Ln = La; Nd, Sm, Gd, Er, Y; dmit(2-) = 1,3-dithiole-2-thione -4,5-dithiolate anion; phen = 1,10-phenanthroline) have been pre pared and characterized by means of elemental anlaysis, IR spectra, electro nic spectra and conductivity measurements. These complexes behave as i nsulators at 25 degrees C as compacted pellets.-On doping iodine into the complexes, they have been partially oxidized to afford K-2[Ln(dmit )(phen)(2)Cl-3]. Ix (Ln = La, x = 3.5; Ln = Er, x = 3.0), whose electr ical conductivities are raised to the range of semi-conductors. The na ture of the iodine species in these solids is determined by UV-visible and resonance Raman spectroscopies. (C) 1998 Elsevier Science Ltd. Al l rights reserved.