scholarly journals Люминесцентные свойства соединений европия(III) с хинолиновой кислотой и фосфорсодержащими нейтральными лигандами

2019 ◽  
Vol 127 (8) ◽  
pp. 231
Author(s):  
И.В. Калиновская
Keyword(s):  
Quinolinic Acid ◽  
Excitation Energy Transfer ◽  
Luminescent Properties ◽  
Complex Compounds ◽  
Mixed Ligand ◽  
Electronic Excitation Energy Transfer ◽  
Electronic Excitation Energy ◽  
Phosphorus Containing ◽  
Neutral Ligands ◽  
Two Stages

AbstractLuminescent mixed-ligand europium(III) complexes with quinolinic acid and phosphorus-containing neutral ligands with a dimeric structure of the composition Eu_2(QA)_3 · 3Н_2О, Eu_2(QA)_3 · D · 2Н_2О, where QA is quinolinic acid and D is hmpa (hexamethylphosphortriamide), tppo (triphenylphosphinoxide), (hmpa), or Et_6pa (hexaethylphosphortriamide), are synthesized. The thermal and spectral-luminescent properties of the synthesized complex mixed-ligand europium(III) compounds are studied. It is shown that the detachment of water and neutral ligand molecules during thermolysis occurs in two stages with endothermic effects and that the complex compounds are stable at temperatures up to 320°С. It is found by IR spectroscopy that quinolinic acid coordinates to the europium(III) ion by two carboxylate ions. The low luminescence intensity of mixed-ligand europium(III) quinolinates is explained by inefficient electronic excitation energy transfer from quinolinic acid and phosphorus-containing neutral ligands to europium ions.

scholarly journals Спектрально-люминесцентные свойства разнолигандных комплексных соединений европия(III) с n-метилбензойной кислотой

2019 ◽  
Vol 127 (11) ◽  
pp. 765
Author(s):  
И.В. Калиновская ◽  
А.Н. Задорожная
Keyword(s):  
Electronic Absorption Spectra ◽  
Excitation Energy Transfer ◽  
Luminescent Properties ◽  
Triphenylphosphine Oxide ◽  
Luminescence Spectra ◽  
Nitrogen And Phosphorus ◽  
Excitation Spectra ◽  
Stark Structure ◽  
Phosphorus Containing ◽  
Neutral Ligands

Abstract The spectral-luminescent properties of europium(III) complexes with p -methylbenzoic acid and nitrogen- and phosphorus-containing neutral ligands of compositions [Eu( p -MBA)_3 · D]_2 · x H_2O and [Eu( p ‑MBA)_3 · 2H_2O]_ n , where p -MBA is the anion of p -methylbenzoic acid and D is 1,10-phenanthroline (phen), 2,2' dipyridyl (dipy), triphenylphosphine oxide (tppo) ( х = 0), hexamethylphosphortriamide (hmpa) ( x = 1), or benzotriazole (bt) ( x = 2) are studied. The electronic absorption spectra, the luminescence excitation spectra, and the Stark structure of ^5 D _0−^7 F _ j (  j = 0–2) electronic transitions in low-temperature luminescence spectra of complex europium(III) p -methylbenzoates are analyzed. It is found that the excitation energy transfer to europium ions occurs from the levels of both p -methylbenzoic acid and neutral ligands.

scholarly journals Разнолигандные комплексные соединения европия (III) с o-метоксибензойной кислотой и фосфорсодержащими нейтральными лигандами

2020 ◽  
Vol 128 (5) ◽  
pp. 612
Author(s):  
И.В. Калиновская
Keyword(s):  
Triphenylphosphine Oxide ◽  
Complex Compounds ◽  
Endothermic Effect ◽  
Ligand Molecule ◽  
Electronic Excitation Energy ◽  
Hexamethylphosphoric Triamide ◽  
Europium Ion ◽  
Phosphorus Containing ◽  
Neutral Ligands ◽  
Methoxybenzoic Acid

The luminescent coordination multi-ligand compounds of europium (III) with o-methoxybenzoic acid and island-containing phosphorus-containing neutral ligands of the composition Eu (MOBA) 3 • 3Н2О and Eu (MOBA) 3 • L, where MOBA is o-methoxybenzoic acid, D is hmpa (D hexamethylphosphoric triamide), tppo (triphenylphosphine oxide), Et6pa (hexaethylphosphotriamide). The composition, structure, and thermal properties of complex multi-ligand compounds of europium (III) were studied. It was shown that during thermolysis, detachment of a neutral ligand molecule occurs in one stage with an endothermic effect, complex compounds are stable up to 280 С.Based on the data of IR spectroscopy, it was found that in the europium (III) o-methoxybenzoates, the o-methoxybenzoic acid is coordinated to the europium (III) o-methoxybenzoic ion in a bidentate manner. The low luminescence intensity of multi-ligand europium (III) compounds is explained by the inefficient transfer of electronic excitation energy from o-methoxybenzoic acid and phosphorus-containing neutral ligands to the europium ion.

Energy transfer in liquid and solid nanoobjects: application in luminescent analysis

2018 ◽  
Vol 4 (3) ◽  
Author(s):  
T. D. Smirnova ◽  
S. N. Shtykov ◽  
E. A. Zhelobitskaya
Keyword(s):  
Energy Transfer ◽  
Physical Phenomenon ◽  
Excitation Energy Transfer ◽  
Electronic Energy ◽  
Luminescence Spectroscopy ◽  
Electronic Excitation Energy Transfer ◽  
Electronic Excitation Energy ◽  
Protein Chemistry ◽  
Luminescent Analysis ◽  
Donor And Acceptor

Abstract Radiationless resonance electronic excitation energy transfer (ET) is a fundamental physical phenomenon in luminescence spectroscopy playing an important role in natural processes, especially in photosynthesis and biochemistry. Besides, it is widely used in photooptics, optoelectronics, and protein chemistry, coordination chemistry of transition metals and lanthanides as well as in luminescent analysis. ET involves the transfer of electronic energy from a donor (D) (molecules or particles) which is initially excited, to an acceptor (A) at the ground state to emit it later. Fluorescence or phosphorescence of the acceptor that occurs during ET is known as sensitized. There do many kinds of ET exist but in all cases along with other factors the rate and efficiency of ET in common solvents depends to a large extent on the distance between the donor and the acceptor. This dependency greatly limits the efficiency of ET and, correspondingly, does not allow the determination of analytes in highly diluted (10–9–10–15 M) solutions. To solve the problem of distance-effect, the effects of concentrating and bring close together the donor and acceptor in surfactant micelles (liquid nanosystems) or sorption on solid nanoparticles are used. Various approaches to promote the efficiency of ET for improvement determination selectivity and sensitivity using liquid and solid nanoobjects is reviewed and analyzed.

Theoretical investigation of electronic excitation energy transfer in bichromophoric assemblies

2008 ◽  
Vol 128 (7) ◽  
pp. 074505 ◽  
Author(s):  
Burkhard Fückel ◽  
Andreas Köhn ◽  
Michael E. Harding ◽  
Gregor Diezemann ◽  
Gerald Hinze ◽  
...  
Keyword(s):  
Energy Transfer ◽  
Excitation Energy ◽  
Theoretical Investigation ◽  
Electronic Excitation ◽  
Excitation Energy Transfer ◽  
Electronic Excitation Energy Transfer ◽  
Electronic Excitation Energy
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