Syntheses and Structural Researches of Yb~(3+) Complexes with Nitrilotriacetic Acids──Nine-coordinate K_3[Yb(nta)_2(H_2O)]·5H_2O and Eight-coordinate Na_3[Yb(nta)_2]·6H_2O Complexes

IntroductionBecause the rare earth metal compounds havethe promotion to the growth of animals andplants1] ,and the functions of antiinflammation,antibacterium2 ] ,anticoagulantion3 ] and anti-caner4] ,the investigation on the syntheses and bio-logical activities of the rare earth metal compoundshas attracted many chemists attention.The com-pounds of heavy rare earth element Yb are consid-ered as the representative of these rare earth metalcompounds.Otherwise,the radioactive rare earthmetal…

Syntheses and Structural Researches of Yb3+ Complexes with Nitrilotriacetic Acids--Nine-coordinate K3[Yb(nta)2(H2O)]·5H2O and Eight-coordinate Na3[Yb(nta)2]·6H2O Complexes

Yb3+ complexes with two nitrilotriacetic acid molecules were prepared and their compositions were determined as K3Yb(nta)2(H2O)]*5H2O and Na3Yb(nta)2]*6H2O by elemental analyses. Their structures were characterized by single-crystal X-ray diffraction analyses. In complex K3Yb(nta)2(H2O)]*5H2O, the YbN2O7 part forms a nine-coordinate monocapped square antiprismatic structure. In complex Na3Yb(nta)2]*6H2O, the YbN2O6 part forms an eight-coordinate square antiprismatic structure. It can be seen that the outer cations (K+ and Na+) greatly affect the coordination number and coordinate structure from these results.