Synthesis, spectroscopic, thermochemical properties of lanthanide complexes with 3,4-Diethoxybenzoic acid and 1,10-phenanthroline

Abstract

Three novel lanthanide complexes [Ln(3,4-DEOBA)³phen]²[Ln=Eu(1), Tb(2), Dy(3); 3,4-DEOBA=3,4- diethoxybenzoate; phen=1,10-phenanthroline] were synthesized and characterized by elemental analysis, molar conductance, X-ray diffraction and infrared spectrometry. The luminescence spectra of complexes 1 and 2 show the characteristic emission of Eu³⁺ ion(⁵ D ₀→⁷ F _0—3) and Tb³⁺ ion(⁵ D ₄→⁷ F _6—3). The thermal decomposition mechanism of the title complexes and the analysis of the evolved gases were investigated by thermogravimetry/differential scanning calorimetry-Fourier transform infrared(TG/DSC-FTIR) technology. The results indicate the complexes are thermally stable. In the thermal decomposition of the complexes, phen molecules lost firstly, and then 3,4-DEOBA ligand decomposed into H₂O, CO₂ and other gaseous molecules. Besides, several gaseous organic fragments were also detected. The heat capacities of complexes 1―3 were measured by DSC in a temperature range of 263.15―340.15 K. Based on the fitted polynomial and thermodynamic equations, the smoothed heat capacities and thermodynamic functions of the three complexes were calculated. The study on biological activity showed that the complexes exhibited good antibacterial activity against Candida albicans, Staphylococcus aureus and Escherichia coli.

Keywords

Lanthanide complex / Thermodynamics / Thermal decomposition / Heat capacity / 3,4-Diethoxybenzoic acid

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