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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 26, Number 8
BKCSDE 26(8)
August 20, 2005 

Lanthanide Complexes of Some High Energetic Compounds (II), Crystal Structures and Thermal Properties of Picrate Complexes
Sock-Sung Yun*, Sung Kwon Kang*, Hong-Ryol Suh, Hyung-Sock Suh, Eun Kwang Lee, Jae-Kyung Kim, Chong-Hyeak Kim
Lanthanide complex, Picric acid, Thermal analysis, Crystal structure
The Ln(III) complexes with picrate ligand, [Sm(Pic)2(H2O)6]Pic·6H2O, 1, and [Ho(Pic)(H2O)7](Pic)2·3H2O, 2, have been synthesized and their crystal structures are analyzed by X-ray diffraction methods. Complex 1, crystallizes in the monoclinic P21/n space group and complex 2 in the triclinic P-1 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.
1197 - 1202
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