Natrajan Louise S, Timmins Phillipa L, Lunn Matthew, Heath Sarah L
Department of Chemistry, University of Manchester, Oxford Road, Manchester M13 9PL, U.K.
Inorg Chem. 2007 Dec 10;46(25):10877-86. doi: 10.1021/ic701366f. Epub 2007 Nov 7.
The synthesis and characterization of a series of anionic homobimetallic lanthanide complexes of the septadentate chelate 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 dimeric pairs in the solid state. Proton NMR, diffusion-ordered spectroscopy, and luminescence solution studies suggest that 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 the terbium, 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 limit of 1 x 10(-12) M, rendering this compound a potential candidate for time-resolved applications.
本文描述了一系列七齿螯合物5-Me-HXTA（N,N-(2-羟基-5-甲基-1,3-二甲苯撑)双(N-(羧甲基)甘氨酸)）的阴离子同核双金属镧系配合物的合成与表征（Ln = Nd、Sm、Eu、Tb、Dy、Ho、Er、Yb）。单晶X射线晶体学证实这些配合物在固态下以离散的二聚体对形式存在。质子核磁共振、扩散有序光谱和发光溶液研究表明，在一系列分析上有用的浓度范围内，双核化学计量比在水溶液中得以保留。酚类发色团有效地敏化了铽、钕和镱衍生物中以镧系元素为中心的可见和近红外发射，产生了特别长寿命的绿色和近红外发射。铽配合物在水溶液中显示出约50%的高量子产率和1×10(-12) M的低检测限，使该化合物成为时间分辨应用的潜在候选物。
