Institute of Chemistry, Far East Branch of Russian Academy of Sciences, Vladivostok 690022, Russia; Nevelskoy Maritime State University, Vladivostok 690059, Russia.
Institute of Chemistry, Far East Branch of Russian Academy of Sciences, Vladivostok 690022, Russia.
Spectrochim Acta A Mol Biomol Spectrosc. 2018 Jul 5;200:70-75. doi: 10.1016/j.saa.2018.03.084. Epub 2018 Apr 3.
The effect of methylamine vapor on luminescence of Eu(III) tris-benzoylacetonate (I) immobilized in thin-layer chromatography plates has been investigated. It has been revealed that interaction of I with analyte vapor results in increase of the intensity of Eu(III) luminescence. The mechanism of the effect of methylamine vapors on intensification of the Eu(III) luminescence has been suggested using the data of IR spectroscopy and quantum chemistry calculations. The mechanism of luminescence sensitization consists in bonding of an analyte molecule with a water molecule into the coordination sphere of Eu(III). As a result, the bond of a water molecule with the luminescence centre weakens, rigid structural fragment including europium ion, water and methylamine molecules forms. The presence of such fragment must naturally promote decrease of influence of OH-vibrations on luminescence of the complex I.
研究了甲胺蒸气对薄层色谱板中固载的 Eu(III) 三苯甲酰丙酮（I）发光的影响。结果表明，I 与分析物蒸气的相互作用导致 Eu(III)发光强度增加。利用红外光谱和量子化学计算数据，提出了甲胺蒸气增强 Eu(III)发光的作用机制。发光敏化的机制包括将分析物分子与水分子键合到 Eu(III)的配位球中。结果，与发光中心的水分子键减弱，形成包括镧系元素离子、水和甲胺分子的刚性结构片段。这种片段的存在自然会促进减弱 OH 振动对配合物 I 发光的影响。
