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Title: Hydrothermal synthesis and characterization of lanthanide oxalates: In situ oxalate formation from tartaric acid in presence of KI
Authors: Athar, Muhammad
Qureshi, Ashfaq Mahmood
Li, Guanghua
Shi, Zhan
Feng, Shouhua
Keywords: Hydrothermal synthesis
Tartaric acid
Potassium iodide
Issue Date: May-2012
Publisher: NISCAIR-CSIR, India
Abstract: Two new three-dimensional lanthanide oxalates [Pr2(C2O4)3(H2O)4]·2H2O (1) and [Nd2(C2O4)3(H2O)4]·2H2O (2) and a two-dimensional oxalate [Pr2(C2O4)3(H2O)6]·3H2O (3) have been prepared by hydrothermal process and characterized by single crystal X-ray analysis. Compound (1) crystallizes in monoclinic crystal system with P21/c space group whereas (2) crystallizes in triclinic crystal system with Pī space group. Although Pr and Nd are twin lanthanides, they have produced different crystal structures under the same reaction conditions. Compound (3) is produced by the in situ hydrothermal degradation of tartaric acid to oxalate ions in presence of KI. In this reaction, the iodide anion instead of metal cation, acts as the reducing agent during the degradation of tartaric acid to oxalate. Thermogravimetric, elemental analysis and IR studies have also been carried out for these compounds.
Description: 708-713
ISSN: 0975-0975(Online); 0376-4710(Print)
Appears in Collections:IJC-A Vol.51A(05) [May 2012]

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