NDLI: A blue luminescent MOF as a rapid turn-off/turn-on detector for $H_{2}O,$ $O_{2}$ and $CH_{2}Cl_{2},$ MeCN: $^{3}_{∞}[Ce(Im)

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Mai, M. Zurawski, A. Meyer, L. V. Feldmann, C. Schönfeld, F. Müller-buschbaum, K.
Description	Author Affiliation: Meyer LV ( Institute of Inorganic Chemistry, Julius-Maximilians-University Würzburg, Am Hubland, 97074 Würzburg, Germany. k.mueller-buschbaum@uni-wuerzburg.de.)
Abstract	The blue emitting luminescent MOF $^{3}_{∞}[Ce(Im)_{3}ImH]·ImH$ forms a 3D-framework with Kagomé net topology. The framework exhibits an intense blue luminescence which can be retained upon activation of the MOF with the formula $^{3}_{∞}[Ce(Im)_{3}ImH].$ 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 $Ce^{3+}$ – 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 250000:1) 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 $Ce^{3+}-emission.$ 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.
ISSN	14779226
Issue Number	9
Journal	Dalton Trans.
Volume Number	44
e-ISSN	13645447
Language	English
Publisher	Royal Society of Chemistry
Publisher Date	2015-03-07
Publisher Place	Great Britain (UK)
Access Restriction	Subscribed
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Inorganic Chemistry

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