Tl2C2O4·H2C2O4: a new interesting crystalline form of thallium(I)oxalate

OSCAR E. PIRO; GUSTAVO A. ECHEVERRÍA; ANA C. GONZÁLEZ-BARÓ; ENRIQUE J. BARAN

ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B - A JOURNAL OF CHEMICAL SCIENCES

VERLAG Z NATURFORSCH

Lugar: Tübingen; Año: 2015 vol. 70 p. 249 - 252

0932-0776

The title compound was prepared by reaction, in aqueous solution, of Tl2CO3 and  H2C2O4·2H2O in a molar ratio of 1:2. Its crystal structure was solved by X-ray diffraction methods. It crystallizes in the monoclinic space group P21/a with Z = 2 molecules per unit cell. The oxalic acid molecule and the oxalate anion are planar, residing on crystallographic inversion  centers, and linked to each other by strong O?H···O hydrogen bonds giving rise to a polymeric structure. The Tl(I) ion is in a distorted polyhedral coordination with nine neighboring O atoms, five of oxalate anions and four others of oxalic acid molecules. The FTIR and FT-Raman spectra of the compound werealso recorded and are briefly discussed.