Substitutional Photoluminescence Modulation in Adducts of a Europium Chelate with a Range of Alkali Metal Cations: A Gas-Phase Study

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• 作者：Jean-Francois Greisch ; Michael E. Harding ; Bernhard Sch?fer ; Martin Rotter ; Mario Ruben ; Wim Klopper ; Manfred M. Kappes ; Detlef Schooss
• 刊名：Journal of Physical Chemistry A
• 出版年：2014
• 出版时间：January 9, 2014
• 年：2014
• 卷：118
• 期：1
• 页码：94-102
• 全文大小：396K
• ISSN：1520-5215

文摘

We present gas-phase dispersed photoluminescence spectra of europium(III) 9-hydroxyphenalen-1-one (HPLN) complexes forming adducts with alkali metal ions ([Eu(PLN)₃M]⁺ with M = Li, Na, K, Rb, and Cs) confined in a quadrupole ion trap for study. The mass selected alkali metal cation adducts display a split hypersensitive ⁵D₀ 鈫?⁷F₂ Eu³⁺ emission band. One of the two emission components shows a linear dependence on the radius of the alkali metal cation whereas the other component displays a quadratic dependence thereon. In addition, the relative intensities of both components invert in the same order. The experimental results are interpreted with the support of density functional calculations and Judd鈥揙felt theory, yielding also structural information on the isolated [Eu(PLN)₃M]⁺ chromophores.