Lanthanide Complexes of Some High Energetic Compounds (II),Crystal Structures and Thermal Properties of Picrate Complexes

摘要

The Ln(III) complexes with picrate ligand,[Sm(Pic)_2(H_2O)_6]Pic centre dot 6H_2O,1,and [Ho(Pic)(H_2O)_7](Pic)_2 centre dot 3H_2O,2,have been synthesized and their crystal structures are analyzed by X-ray diffraction methods.Complex 1,crystallizes in the monoclinic P2_1 space group and complex 2 in the triclinic P- space group.In complex 1,two picrate ligands coordinate to the Sm(III) ion,one of them in the bidentate fashion.There are one picrate anion and six water molecules in the crystal lattice.The nine-coordinated Sm(III) ion forms a slightly distorted tricapped trigonal prism.In complex 2,only one picrate ligand coordinates to the metal ion as a monodentate.There are two picrate anions and three water molecules in the crystal lattice.The eight-coordinated Ho(III) ion forms a distorted bicapped trigonal prism.Based on the results of the TG-DTG and DSC thermal analysis,it was analyzed that the lanthanide picrate complexes 1 and 2 are thermally decomposed in three distinctive stages,the dehydration,the picrate decomposition,and the formation of the metal oxide.