ISSN 1002-1027　　CN 11-2952/G2

### Synthesis and Crystal Structure of a Heteronuclear Complex of Erbium-Yttrium with Glutamic Acid: [ErY(Glu)2(H2O)8](ClO4)4•2.75H2O

LI Junran1, ZHOU Liping1, JIN Tianzhu1, YU Kaibei2

1. 1College of Chemistry and Molecular Engineering, State Key Laboratory of Rare Earth Materials Chemistry and Applications, Peking University, Beijing, 100871; 2Chengdu Center of Analysis and Measurement, Academia Sinica, Chengdu, 6100
• Received:1996-12-09 Online:1997-07-20 Published:1997-07-20

Abstract: The title complex was synthesized in an aqueous solution and its crystal structure was determined by X-ray diffraction. The crystal is monoclinic with space group P21. The cell parameters are: a=1.10390(10)nm, b=1.6493(2)nm, c=1.9986(3)nm, β=103.600(10)0, V=3.5367(8)nm3, Z=4, Dc=2.141g/cm3. The final R is 0.0311. The complex molecule is an infinite layer built from binuclear polymer. In each binuclear unit, two metal ions are connected by four bridging carboxyl groups from four glutamic acid molecules, two carboxyl groups of near the NH2 are simple bridging coordination and the carboxyl groups far from NH2 tridentate to the central ions. Each metal ion is also coordinated by four water molecules. So the coordination number of the central ion is nine, and forming a trigontetradecahedron arrangement.