Synthesis, Structure, and Properties of a Heterometallic Coordination Complex Based on Trimesic Acid

Abstract

By the reaction of CaCl₂, CoSO₄•7H₂O and trimesic acid, a novel heterometallic coordination complex [CoCa(HTMA)₂(H₂O)₈]_n has been synthesized. The structure was characterized by elemental analyses, IR spectra, UV spectra, TG, X-ray powder diffraction and X-ray single crystal diffraction. The X-ray single crystal diffraction analysis reveals that complex crystallizes in the monoclinic C2/c space group, a = 1.78498(10) nm, b = 2.01539(4) nm, c = 0.65430(4) nm, V = 2.32814(21) nm³, Z = 4. In the complex, central Ca(II) ion is eight-coordinated, Co(II) ion is six-coordinated. The Ca(II) and Co(II) ions are bridged by H₃TMA ligands to generate a 1D irregular folded chain, and adjacent chains are further packed into a 3D framework with strong π-π interactions. The TG analysis indicates the complex is stable below 108°C. The X-ray powder diffraction (PXRD) analysis confirms the product to be single phase.

Keywords:

• trimesic acid
• heterometallic coordination complex
• crystal structure
• π-π interactions

Funding

The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (51108122 and 21371159), Youth Foundation of Shanxi Province (2010021022-1).

SupplementaryMaterial

Crystallographic data for the structure reported in this paper in the form of CIF file has been deposited with the Cambridge Crystallographic Data Centre as supplementary publication Nos. CCDC: 972793, respectively. Copy of the data can be obtained free of charge on application to CCDC, 12 Union Road, Cambridge CB2 IEZ, UK (Fax: [phone]; E-mail: [email protected])