A Chiral Three Dimensional Potassium(I)/Strontium(II)/Chromium(III) Oxalato-Bridged Coordination Polymer: Synthesis, Characterization and Thermal Analysis

Justin Nenwa¹, Issoufou Kaboré¹, Yves A. Mbiangué², Patrick L. Djonwouo¹, Peter T. Ndifon¹

¹Department of Inorganic Chemistry, University of Yaounde 1, Yaounde, Cameroon.
²Chemistry Department, Higher Teachers’ Training College, University of Maroua, Maroua, Cameroon.

DOI: 10.4236/csta.2014.34008                

Abstract

A new compound of general formula {[(H₂O)₂K(μ-H₂O)Sr]@[Cr(C₂O₄)³]}_n (1) has been synthesized in water and characterized by elemental and thermal analyses, EDX, IR and UV-Vis spectroscopies and by single crystal X-ray structure determination. Compound 1 crystallizes in the chiral space group Fdd2 of orthorhombic system with a = 14.110 (4) ?, b = 36.074 (11)?, c =11.034 (3)? and Z = 16. Compound 1 is a coordination polymer in which the three-dimensional lattice framework is realized by the interconnectivity between K⁺ cations, Sr²⁺ cations, aqua ligands and [Cr(C₂O₄)₃]^3– complex anions. The asymmetric unit of 1 consists of one cationic motif formally written [(H₂O)₂K(μ-H₂O)Sr]³⁺ and one anionic entity, [Cr(C₂O₄)₃]^3–. The K⁺ and Sr²⁺ ions in the cationic motif are both eight-coordinate while the Cr³⁺ ions in the anionic complex are six-coordinate in a distorted octahedral geometry. Coulombic interactions between the ionic motifs and the three-dimensional H-bonding involving aqua ligands help to consolidate the bulk structure. Thermogra-vimetric analysis (TGA) shows that compound 1 is stable to heat up to ca. 80℃.

Keywords

Tris(Oxalato)Chromate(III) Anion, Heterometallic Complex Polymer, Chiral Compound, Crystal Structure, Thermal Stability

Conflicts of Interest

The authors declare no conflicts of interest.

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