title: Crystal structures and spectroscopic characterization of galactitol complexes of trivalent lanthanide and divalent alkaline earth chlorides.
abstract: Crystal structures and FT-IR spectra of metal ion-galactitol (C6H14O6, the ligand here abbreviated as L) complexes: 2LaCl3*C6H14O6*10H2O and SrCl2*C6H14O6 complexes are reported. Crystal data of lanthanide chlorides (La3+, Nd3+, Sm3+, Eu3+, Tb3+)-galactitol complexes and alkaline earth chlorides (Ca2+, Sr2+)-galactitol complexes published earlier are summarized. Unlike other lanthanide ion-galactitol complexes (2MCl3*C6H14O6*14H2O), lanthanum ions give rise to two different structures: LaCl3*C6H14O6*6H2O (LaL1) and 2LaCl3*C6H14O6*10H2O (LaL2). Sr2+-galactitol complexes also crystallized with two structures: SrCl2*C6H14O6*4H2O (SrL1) and SrCl2*C6H14O6 (SrL2). These metal ions thus give different coordination structures with galactitol. The crystal structures and FT-IR spectra of lanthanide ion and alkaline earth ion-galactitol complexes were integrated to interpret the coordination modes of different metal ions. Similar IR spectra demonstrate the same coordination modes of the complexes.
authors.affiliation: Bioorganic Phosphorous Chemistry and Chemical Biology Laboratory of Educational Ministry, Department of Chemistry, Tsinghua University, Beijing 100084, China.
authors.forename: Yunlan
authors.initials: Y
authors.lastname: Su
authors.forename: Limin
authors.initials: L
authors.lastname: Yang
authors.forename: Zheming
authors.initials: Z
authors.lastname: Wang
authors.forename: Xianglin
authors.initials: X
authors.lastname: Jin
authors.forename: Shifu
authors.initials: S
authors.lastname: Weng
authors.forename: Chunhua
authors.initials: C
authors.lastname: Yan
authors.forename: Zhiwu
authors.initials: Z
authors.lastname: Yu
authors.forename: Jinguang
authors.initials: J
authors.lastname: Wu
mesh_terms: D003460:Crystallization; D018360:Crystallography, X-Ray / Q000379:methods; D004376:Galactitol / Q000737:chemistry*; D006860:Hydrogen Bonding; D007811:Lanthanum / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods*; D013324:Strontium / Q000737:chemistry*
chemical_list: C028521:lanthanum chloride; D004376:Galactitol; D007811:Lanthanum; C025700:strontium chloride; D013324:Strontium