title: Complexation of trivalent lanthanide cations by erythritol in the solid state. The crystal structure and FT-IR study of 2EuCl3.2C4H10O4.7H2O.
abstract: Erythritol was chosen to study the interactions between metal ions and carbohydrates. FTIR spectroscopy results indicate that a EuCl3-erythritol complex different from a previously reported one was obtained. The crystal structure of EuCl3-erythritol complex, 2EuCl3.2C4H10O4.7H2O, Mr=443.49, a=13.846(3) A , b=7.4983(15) A, c=14.140(3) A, beta=116.39(3) degrees, V=1315.1(5) A(3), Z=4, mu=5.394 mm(-1) and R=0.0395 for 2965 observed reflections and 143 parameters, was determined. Characteristic of this complex is the presence of binuclear europium ions with different coordination structures. One Eu3+ ion is nine-coordinated, with five Eu-O bonds from water molecules, and four from hydroxyl groups of two erythritol molecules and another Eu3+ is eight-coordinated with two water molecules, two chloride ions, and four hydroxyl groups from two erythritol molecules. Erythritol provides two hydroxyl groups to one lanthanide ion and the other two to another rare earth ion. The OH, CO stretching and other vibrations are shifted in the IR spectra of the complexes and the results are consistent with the crystal structure.
authors.affiliation: The State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China.
authors.forename: Limin
authors.initials: L
authors.lastname: Yang
authors.forename: Yizhuang
authors.initials: Y
authors.lastname: Xu
authors.forename: Xin
authors.initials: X
authors.lastname: Gao
authors.forename: Shiwei
authors.initials: S
authors.lastname: Zhang
authors.forename: Jinguang
authors.initials: J
authors.lastname: Wu
mesh_terms: D002412:Cations; D018360:Crystallography, X-Ray; D004896:Erythritol / Q000737:chemistry; D005063:Europium / Q000737:chemistry; D017665:Hydroxyl Radical; D007477:Ions; D007700:Kinetics; D028581:Lanthanoid Series Elements / Q000737:chemistry*; D008024:Ligands; D008674:Metals, Rare Earth / Q000737:chemistry; D008958:Models, Molecular; D010087:Oxides / Q000737:chemistry; D013053:Spectrophotometry; D013055:Spectrophotometry, Infrared; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013059:Spectrum Analysis, Raman
chemical_list: D002412:Cations; D007477:Ions; D028581:Lanthanoid Series Elements; D008024:Ligands; D008674:Metals, Rare Earth; D010087:Oxides; D017665:Hydroxyl Radical; D005063:Europium; D004896:Erythritol