Concentration-independent pH detection with a luminescent dimetallic Eu(III)-based probe.

Concentration-independent pH detection with a luminescent dimetallic Eu(III)-based probe.
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DOI:
10.1021/ja307098z
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发表时间:
2012-10-24
影响因子:
15
通讯作者:
Allen MJ
Allen MJ
中科院分区:
化学1区
文献类型:
--
作者:
Moore JD;Lord RL;Cisneros GA;Allen MJ

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合成了一种ph响应发光双金属铕(III)配合物,并表现出独特的响应机制。由于缺乏与Eu(III)离子配位的水分子,该配合物的发光衰减速率较慢。然而,在4到8的生物学相关范围内,发光衰减率随着pH值的增加而降低。物理表征和计算分析表明,pH响应是由于桥接醇氧化物在较低pH值下的质子化反应。发光衰减率的调制与Eu(III)的浓度无关,我们期望这在体内pH的非侵入性成像中有用。
A pH-responsive, luminescent, dimetallic Eu(III)-containing complex has been synthesized and exhibits a unique mechanism of response. The luminescence-decay rate of the complex is slow, due to a lack of water molecules coordinated to the Eu(III) ions. However, the luminescence-decay rate decreases with increasing pH over a biologically relevant range of 4 to 8. Physical characterization and computational analysis suggest that the pH response is due to protonation of a bridging alkoxide at lower pH values. Modulation of the luminescence-decay rate is independent from the concentration of Eu(III), which we expect to be useful in the non-invasive imaging of in vivo pH.
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