Luminescent Dinuclear Lanthanide Complexes of 5-Me-HXTA

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• 作者：Louise S. Natrajan ; Phillipa L. Timmins ; Matthew Lunn ; Sarah L. Heath
• 刊名：Inorganic Chemistry
• 出版年：2007
• 出版时间：December 10, 2007
• 年：2007
• 卷：46
• 期：25
• 页码：10877 - 10886
• 全文大小：179K
• 年卷期：v.46,no.25(December 10, 2007)
• ISSN：1520-510X

文摘

The synthesis and characterization of a series of anionic homobimetallic lanthanide complexes of the septadentatechelate 5-Me-HXTA (N,N-(2 hydroxy-5-methyl-1,3-xylylene)bis(N-(carboxymethyl)glycine) is described (Ln = Nd,Sm, Eu, Tb, Dy, Ho, Er, Yb). Single X-ray crystallography confirms that the complexes exist as discrete dimericpairs in the solid state. Proton NMR, diffusion-ordered spectroscopy, and luminescence solution studies suggestthat the binuclear stoichiometry is retained in aqueous solution over a range of analytically useful concentrations.The phenolic chromophores effectively sensitize the visible and near-infrared lanthanide-centered emission in theterbium, neodymium, and ytterbium derivatives, giving rise to particularly long-lived green and near-infrared emission.The terbium complex displays a high quantum yield of around 50% in aqueous solution with a low detection limitof 1 × 10^-12 M, rendering this compound a potential candidate for time-resolved applications.