Tl2C2O4 center dot H2C2O4: a new crystalline form of thallium(I) oxalate

摘要

The title compound was prepared by reaction, in aqueous solution, of Tl2CO3 and H2C2O4 center dot 2H(2)O in a molar ratio of 1:2. Its crystal structure was solved by X-ray diffraction methods. It crystallizes in the monoclinic space group P2(1)/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 center dot center dot center dot 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 were also recorded and are briefly discussed.