Structural and Photophysical Properties of Visible- and Near-IR-Emitting Tris Lanthanide(III) Complexes Formed with the Enantiomers of N,N鈥?Bis(1-phenylethyl)-2,6-pyridinedicarboxamide

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• 作者：KimNgan T. Hua ; Jide Xu ; Eliseo E. Quiroz ; Sabrina Lopez ; Andrew J. Ingram ; Victoria Anne Johnson ; Angela R. Tisch ; Ana de Bettencourt-Dias ; Daniel A. Straus ; Gilles Muller
• 刊名：Inorganic Chemistry
• 出版年：2012
• 出版时间：January 2, 2012
• 年：2012
• 卷：51
• 期：1
• 页码：647-660
• 全文大小：614K
• 年卷期：v.51,no.1(January 2, 2012)
• ISSN：1520-510X

文摘

The enantiomers of N,N鈥?bis(1-phenylethyl)-2,6-pyridinedicarboxamide (L), namely, (R,R)-1, and (S,S)-1, react with Ln^III ions to give stable [LnL₃]³⁺ complexes in an anhydrous acetonitrile solution and in the solid state, as evidenced by electrospray ionization mass spectrometry, NMR, luminescence titrations, and their X-ray crystal structures, respectively. All [LnL₃]³⁺ complexes [Ln^III = Eu, Gd, Tb, and Yb; L = (R,R)-1 and (S,S)-1] are isostructural and crystallize in the cubic space group I23. Although the small quantum yields of the Ln^III-centered luminescence clearly point to the poor efficiency of the luminescence sensitization by the ligand and the intersystem crossing and ligand-to-metal energy transfers, the ligand triplet-excited-state energy seems relatively well suited to sensitize many Ln^III ion's emission for instance, in the visible (Eu and Tb), near-IR (Nd and Yb), or both regions (Pr, Sm, Dy, Er, and Tm).