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

Content Provider	Springer Nature Link
Author	Qi, Xiaoxia Zhang, Jianjun Zhang, Dahai Ren, Ning
Copyright Year	2015
Abstract	Three novel lanthanide complexes [Ln(3,4-DEOBA)$^{3}$phen]$^{2}$[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 Eu$^{3+}$ ion($^{5}$ D $_{0}$→$^{7}$ F $_{0—3}$) and Tb$^{3+}$ 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 H$_{2}$O, CO$_{2}$ 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.
Starting Page	1039
Ending Page	1045
Page Count	7
File Format	PDF
ISSN	10059040
Journal	Chemical Research in Chinese Universities
Volume Number	31
Issue Number	6
e-ISSN	22103171
Language	English
Publisher	Jilin University and The Editorial Department of Chemical Research in Chinese Universities
Publisher Date	2015-12-22
Publisher Place	Changchun
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Thermodynamics Chemistry/Food Science Analytical Chemistry Lanthanide complex Thermal decomposition Physical Chemistry Heat capacity 3,4-Diethoxybenzoic acid Inorganic Chemistry Organic Chemistry
Content Type	Text
Resource Type	Article
Subject	Chemistry Education

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