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首页> 外文期刊>Chemistry: A European journal >Azulene-moiety-based ligand for the efficient Sensitization of four near-infrared luminescent lanthanide cations: Nd3+, Er3+, Tm3+, and Yb3+
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Azulene-moiety-based ligand for the efficient Sensitization of four near-infrared luminescent lanthanide cations: Nd3+, Er3+, Tm3+, and Yb3+

机译：基于Azulene部分的配体可有效敏化四个近红外发光镧系阳离子：Nd3 +，Er3 +，Tm3 +和Yb3 +

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摘要

The ML4 complexes formed by reaction between the bidentate azulene-based ligand diethyl 2-hydroxyazulene-1,3-dicarboxylate (HAz) and several lanthanide cations (Pr3+, Nd3+, Gd3+, Ho3+, Er3+, Tm3+, Yb3+, and Lu3+) have been synthesized and characterized by elemental analysis, FT-IR vibrational spectroscopy and electrospray ionization mass spectroscopy. Spectrophotometric titrations have revealed that four Az(-) ligands react with one lanthanide cation to form the ML4 complex in solution. Studies of the luminescence properties of these ML4 complexes demonstrated that Az(-) is an efficient sensitizer for four different near-infrared emitting lanthanide cations (Nd3+, Er3+, Tm3+, and Yb3+); the resulting complexes have high quantum yield values in CH3CN. The near-infrared emission arising from Tm3+ is especially interesting for biologic imaging and bioanalytical applications since biological systems have minimal interaction with photons at this wavelength. Hydration numbers, representing the number of water molecules bound to the lanthanide cations, were obtained through luminescence lifetime measurements and indicated that no molecules of water/solvent are bound to the lanthanide cation in the ML4 complex in solution. The four coordinated ligands protect well the central luminescent lanthanide cation against non-radiative deactivation from solvent molecules.
机译：通过基于双齿氮杂的配体2-乙基羟基二氮杂-1,3-二羧酸二乙酯（HAz）与几种镧系阳离子（Pr3 +，Nd3 +，Gd3 +，Ho3 +，Er3 +，Tm3 +，Yb3 +和Lu3 +）之间的反应形成的ML4复合物通过元素分析，FT-IR振动光谱和电喷雾电离质谱分析合成和表征。分光光度滴定法表明，四个Az（-）配体与一个镧系元素阳离子反应形成溶液中的ML4复合物。对这些ML4配合物的发光性质的研究表明，Az（-）对四种不同的近红外发射镧系元素阳离子（Nd3 +，Er3 +，Tm3 +和Yb3 +）是有效的敏化剂。所得络合物在CH3CN中具有较高的量子产率。 Tm3 +产生的近红外发射对于生物成像和生物分析应用特别有趣，因为生物系统在此波长下与光子的相互作用极小。通过发光寿命测量获得水合数，其表示与镧系元素阳离子结合的水分子的数量，并且表明在溶液中的ML4络合物中没有水/溶剂分子与镧系元素阳离子结合。四个配位配体很好地保护了中心发光镧系元素阳离子免受溶剂分子的非辐射灭活作用。

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