Aqueous Ln(III) luminescence agents derived from a tasty precursor.

Aqueous Ln(III) luminescence agents derived from a tasty precursor.
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DOI:
10.1021/ic8010162
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发表时间:
2008-09-15
影响因子:
4.6
通讯作者:
Raymond KN
Raymond KN
中科院分区:
化学2区
文献类型:
--
作者:
Jocher CJ;Moore EG;Pierce JD;Raymond KN

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报道了一种以麦芽酚为配体的新型四齿配体的合成、水溶液稳定性和物理化学性质。在水溶液中,该螯合物与Ln(III)阳离子形成稳定的配合物,并观察到Eu(III)、Yb(III)和Nd(III)的敏化发射。与最近报道的和结构类似的配体的比较揭示了与Eu(III)[pEu = 14.7(1)]的稍高的碱度但较低的络合物稳定性。观察到Eu(III)的非常差的金属中心量子产率(Φtot = 0.04%),这可以通过配体三重态和Eu(III)5D0发射能级的相似能量来合理化。相反,观察到Yb(III)和Nd(III)阳离子的敏化发射,其发射近红外(NIR)。
The synthesis, aqueous stability and photophysical properties are reported for a novel tetradentate ligand derived from maltol, a commonly used flavor enhancer. In aqueous solution, this chelate forms stable complexes with Ln(III) cations, and sensitized emission was observed from Eu(III), Yb(III), and Nd(III). A comparison with recently reported and structurally analogous ligands reveals a slightly higher basicity but lower complex stability with Eu(III) [pEu = 14.7 (1)]. A very poor metal centered quantum yield with Eu(III) was observed (Φtot = 0.04 %), which can be rationalized by the similar energy of the ligand triplet state and the Eu(III) 5D0 emissive level. Instead, sensitized emission from the Yb(III) and Nd(III) cations was observed, which emit in the Near Infra-Red (NIR).
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