Mixed-Ligand Complex Compounds of Europium(III) with ortho-Methoxybenzoic Acid and Phosphorus-Containing Neutral Ligands

Abstract

Luminescent coordination mixed-ligand compounds of europium(III) with ortho-methoxybenzoic acid and phosphorus-containing neutral ligands of the isle-like structure Eu(MOBA)3 · 3H2O and Eu(MOBA)3 · L have been synthesized. MOBA—ortho-methoxybenzoic acid, L—hmpa (hexamethylphosphotriamide), tppo (triphenylphosphinoxide), Et6pa (hexaethylphosphotriamide). Thermal properties of the complex mixed-ligand compounds of europium(III) have been investigated. It has been shown that thermolysis results in the splitting of a neutral ligand molecule proceeding within one stage along with an endothermic effect. The complex compound appeared to be stable up to 280°C. The composition and structure of the synthesized complexes have been established. Based on the IR spectroscopy data, it has been demonstrated that in ortho-methoxybenzoates of europium(III) ortho-methoxybenzoic acid is coordinated to a europium(III) ion bidentately.

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ACKNOWLEDGMENTS

The work was performed with a financial support of the Ministry of Education and Science of the Russian Federation, the project number of the State Order no. 0265-2019-0001.

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Correspondence to I. V. Kalinovskaya.

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Translated by D. Marinin

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Kalinovskaya, I.V. Mixed-Ligand Complex Compounds of Europium(III) with ortho-Methoxybenzoic Acid and Phosphorus-Containing Neutral Ligands. Opt. Spectrosc. 128, 605–609 (2020). https://doi.org/10.1134/S0030400X20050082

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Keywords:

  • luminescence
  • europium compounds
  • ortho-methoxybenzoic acid
  • thermal properties