An atomic structure of crystals of the complex [Eu_2(Quin)_42Н_2O2Dipy]_2 · 2(NO_3) · Н_2O, (Quin, anion of quinaldic acid; Dipy, 2,2'-dipyridyl), which exhibited intense luminescence and triboluminescence, has been investigated via the X-ray diffraction analysis. The structure of crystals of the compound appeared to be of an islelike type and were represented by two separate crystallographically independent complex dimers, outer-sphere [NO_3]^−1-groups, and water molecules. Structural aspects of the formation of the luminescent and triboluminescent properties of the compound have been discussed. The role of cleavage planes at crystal destruction has been established.
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.
The spectral and luminescent properties of complex 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 studied (hexamethylphosphoric triamide), tppo (triphenylphosphine oxide), Et6pa (hexaethylphosphotriamide). It was found that the excitation energy is transferred to the europium ion both from the levels of o-methoxybenzoic acid and from the levels of phosphorus-containing neutral ligands.The electronic absorption spectra, the luminescence excitation spectra, and the Stark structure of 5D0-7Fj (j = 0-2) electronic transitions in the luminescence spectra of mixed-ligand complex europium (III) complex o-methoxybenzoates are analyzed. Europium (III) methoxybenzoate with triphenylphosphine oxide has the highest luminescence intensity.
Поступила в редакцию 18.12.2017 г. В окончательной редакции 22.03.2018 г. Синтезированы новые люминесцирующие комплексные разнолигандные соединения европия(III) c хинальдиновой кислотой и фосфорсодержащими нейтральными лигандами димерного строения. Изучено строение, термические и спектрально-люминесцентные свойства комплексных разнолигандных соединений европия(III). Показано, что хинальдинат-ион координируется к иону европия(III) бидентатно. Обнаружено, что передача энергии возбуждения на ион европия(III) осуществляется с уровней хинальдиновой кислоты и фосфорсодержащего нейтрального лиганда.
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