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首页> 外文期刊>Dalton transactions: An international journal of inorganic chemistry >A blue luminescent MOF as a rapid turn-off/turn-on detector for H2O, O-2 and CH2Cl2, MeCN: (3)(infinity)[Ce(Im)(3)ImH]center dot ImH
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A blue luminescent MOF as a rapid turn-off/turn-on detector for H2O, O-2 and CH2Cl2, MeCN: (3)(infinity)[Ce(Im)(3)ImH]center dot ImH

机译：蓝色发光MOF作为H2O，O-2和CH2Cl2的快速关闭/打开检测器，MeCN：（3）（无穷大）[Ce（Im）（3）ImH]中心点ImH

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The blue emitting luminescent MOF (3)(infinity)[Ce(Im)(3)ImH]center dot ImH forms a 3D-framework with Kagome net topology. The framework exhibits an intense blue luminescence which can be retained upon activation of the MOF with the formula (3)(infinity)[Ce(Im)(3)ImH]. The luminescence is metal-based due to parity-allowed 5d-4f-transitions. Time-dependent investigations of the interaction with liquid and gas analytes show that the MOF - by utilising 5d-4f-transitions of Ce3+ - can be used as a high-speed "turn-off" detector for water and oxygen in dry air. Other protic or polar solvents, like methanol, acetone or pyridine, which also show a "turn-off"-effect can be distinguished from water-detection either on a time scale (ranging up to 250 000 : 1) or a shift of the chromaticity, the latter being pronounced for MeOH. The fast time-dependent decrease of the luminescence intensity for water arises from an extremely fast hydrolysis and is irreversible. Polar aprotic molecules like dichloromethane and acetonitrile can also result in a "turn-on"effect of the luminescence intensity due to their behaviour as additional sensitizers for Ce3+-emission. We conclude that the cerium-MOF can be utilised in gas and liquid sensing applications as a detector material for water and oxygen in dry air. The luminescence is intense with good quantum yield between 55% (as-synthesised) and 36% (activated). This implies that only milligram amounts of the material are needed to detect the analyte species and is especially useful, as the MOF can be directly used as-synthesised for water detection in applications for which an irreversible signal change is desired, e.g. preventing a signal change upon unwanted re-drying.
机译：蓝色发光MOF（3）（无限）[Ce（Im）（3）ImH]中心点ImH形成具有Kagome网络拓扑的3D框架。该框架显示出强烈的蓝色发光，该发光可以通过用式（3）（无穷大）[Ce（Im）（3）ImH]激活MOF而保留。由于奇偶校验允许的5d-4f过渡，发光是基于金属的。与液体和气体分析物相互作用的时变研究表明，MOF-通过利用Ce3 +的5d-4f跃迁-可以用作干燥空气中水和氧气的高速“关闭”检测器。其他质子或极性溶剂（如甲醇，丙酮或吡啶）也表现出“关闭”效应，可以在时间范围内（最大范围为250 000：1）将其与水检测区别开来。色度，后者对于MeOH尤为明显。水的发光强度随时间的快速下降是由极快的水解引起的，并且是不可逆的。极性非质子分子，例如二氯甲烷和乙腈，由于其作为Ce3 +发射的附加敏化剂的行为，也可能导致发光强度“打开”。我们得出结论，铈-MOF可在气体和液体传感应用中用作干燥空气中水和氧气的检测器材料。发光强度高，量子产率在55％（合成后）和36％（活化）之间。这意味着仅需要毫克量的材料即可检测分析物种类，并且特别有用，因为在需要不可逆信号变化的应用中，例如，MOF可以直接合成后用于水检测。防止不必要的再次干燥时信号变化。

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