Crystal Structures, Thermal Properties, and Biological Activities of a Series of Lanthanide Compounds with 2,4-Dichlorobenzoic Acid and 1,10-Phenanthroline

Liu, Jing-Yu; Ren, Ning; Zhang, Jian-Jun; He, Shu-Mei; Wang, Shu-Ping

Crystal Structures, Thermal Properties, and Biological Activities of a Series of Lanthanide Compounds with 2,4-Dichlorobenzoic Acid and 1,10-Phenanthroline

2013

Liu, Jing-Yu | Ren, Ning | Zhang, Jian-Jun | He, Shu-Mei | Wang, Shu-Ping

A new family of binuclear lanthanide compounds of general formula [Ln(2,4-DClBA)₃phen]₂ (Ln(III) = Nd (1), Sm (2), Dy (3), Yb (4); 2,4-DClBA = 2,4-dichlorobenzoate; phen = 1,10-phenanthroline) have been synthesized and characterized by elemental analysis, molar conductance, infrared spectroscopy, ultraviolet spectra, thermogravimetric analysis, and single-crystal X-ray diffraction. On the basis of X-ray crystallography, compounds 2–4 belong to the triclinic crystal system, PI̅ space group. In compound 2, the Sm³⁺ ion adopted a distorted monocapped square-antiprism coordination geometry. Compounds 3 and 4 are isomorphous whose central ions (Dy³⁺ and Yb³⁺) formed a distorted square-antiprism geometry. The heat capacities of compounds 1–4 are measured using DSC technology and fitted to a polynomial equation by the least-squares method. The smoothed molar heat capacities and thermodynamic function data of compounds 1–4 relative to the reference temperature 298.15 K are then calculated. Meanwhile, these compounds exhibit in good antifungal activity against C. albicans, good antibacterial activity against S. aureus, and better antibacterial activity against E. coli. The fluorescence spectra of the samarium and dysprosium compounds behave as characteristic transitions of Sm(III) and Dy(III) ions.

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