Iridium-Based Time-Resolved Luminescent Sensor for Ba2+ Detection

IF 9.1 1区化学 Q1 CHEMISTRY, ANALYTICAL ACS Sensors Pub Date : 2025-04-11 DOI:10.1021/acssensors.4c01892

Ane I. Aranburu, Mikel Elorza, Pablo R.G. Valle, Ariadna Pazos, Alexey Brodolin, Pablo Herrero-Gómez, J. Eduardo Barcelon, Gabriel Molina-Terriza, Francesc Monrabal, Celia Rogero, Fernando P. Cossío, Juan José Gómez-Cadenas, Claire Tonnelé, Zoraida Freixa, the NEXT Collaboration

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Abstract

We present a new time-resolved chemosensor for the detection of Ba²⁺ ions. Our sensor is based on an iridium(III) compound with dual (fluorescent and phosphorescent) emission. The nature of the luminescence response of the sensor depends on its state; specifically, the phosphorescence emission of the free state at long wavelengths is strongly suppressed, while that of the Ba²⁺-chelated compound is strongly enhanced. Furthermore, the residual phosphorescence emission of the free compound decays with two short decay constants, τ_free¹ ∼ 3.5 ns (88%) and τ_free² ∼ 209 ns (12%), while the chelated compound decays with two long decay constants, τ_bound¹ ∼ 429 ns (21%) and τ_bound² ∼ 1128 ns (76%). This exceptional behavior, supported by quantum chemical calculations, allows a time-based separation between the signals of the free and the chelated species. Among other applications, our sensor could be the basis of a Ba²⁺ tagging detector for neutrinoless double beta decay searches in xenon.

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基于铱的时间分辨发光传感器用于Ba2+检测

我们提出了一种新的时间分辨化学传感器，用于检测Ba2+离子。我们的传感器基于具有双（荧光和磷光）发射的铱（III）化合物。传感器的发光响应性质取决于其状态；其中，长波长自由态的磷光发射被强烈抑制，而Ba2+螯合物的磷光发射被强烈增强。此外，自由化合物的残余磷光发射以两个短衰减常数τfree1 ~ 3.5 ns（88%）和τfree2 ~ 209 ns（12%）衰减，而螯合化合物则以两个长衰减常数τbound1 ~ 429 ns（21%）和τbound2 ~ 1128 ns（76%）衰减。这种特殊的行为，由量子化学计算支持，允许自由和螯合物种的信号之间基于时间的分离。在其他应用中，我们的传感器可能是用于氙中中微子双β衰变搜索的Ba2+标记探测器的基础。

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来源期刊

ACS Sensors Chemical Engineering-Bioengineering

CiteScore

14.50

自引率

3.40%

发文量

372

期刊介绍： ACS Sensors is a peer-reviewed research journal that focuses on the dissemination of new and original knowledge in the field of sensor science, particularly those that selectively sense chemical or biological species or processes. The journal covers a broad range of topics, including but not limited to biosensors, chemical sensors, gas sensors, intracellular sensors, single molecule sensors, cell chips, and microfluidic devices. It aims to publish articles that address conceptual advances in sensing technology applicable to various types of analytes or application papers that report on the use of existing sensing concepts in new ways or for new analytes.