Abstract
This study presents a general method which can be used for the synthesis of mononuclear complexes with europium(III) and organic ligands with carboxylic groups. It describes the procedure for preparing a new mononuclear coordination complex with europium(III) and carboxylate ligands sourced from benzoic acid. The construction of mononuclear complexes with a coordination sphere saturated in carboxylic ligands must go through the preparation and purification of a europium(III) intermediate complex that presents a coordination sphere with anions that will be later exchanged for carboxylic groups and finally precipitated as a solvent-free or anion-free complex within the coordination sphere. The detailed synthesis procedure for powders of a new complex, as well as studies of its structural composition at each phase and luminescent properties, are detailed in this study. Analytical and spectroscopic data reveal the formation of a new mononuclear complex of the general formula [Eu(OOCC6H5)3·(HOOCC6H5)2]. The crystal structure of the Eu(III) complex was solved using X-ray powder diffraction data and EXPO2014 software, and the crystal structure result was deposited in the CCDC service with number 19771999.
Highlights
In recent decades, there has been scientific and technological development regarding the use of lanthanides due to their versatility in different areas, including chemical analysis [1], catalysis [2]and biologic applications [3,4]
This study presents the synthesis, structural composition and luminescence properties of new europium(III) complex
A sodium benzoate solution prepared from sodium hydroxide (3 mL, 1 mol L−1 ) and benzoic acid (1) solution (30 mL, 0.1 mol L−1 ) was reacted with europium(III) chloride (10 mL, 0.1 mol L−1 )
Summary
There has been scientific and technological development regarding the use of lanthanides due to their versatility in different areas, including chemical analysis [1], catalysis [2]and biologic applications [3,4]. Europium(III) stands out for its wide range of optical applications; the use of pure lanthanides is uncommon due to their low efficiency of direct absorption of the 4f–4f states [8]. This problem can be solved with the use of ligands that provide an antenna effect, which is defined as a light conversion process via an absorption-energy transfer–emission sequence, where the ligand functions as a light collector and the metal ion emits energy [9,10,11].
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