Dalton Transactions p. 4070 - 4079 (2015)
Update date:2022-08-22
Topics:
Meyer, L. V.
Sch?nfeld, F.
Zurawski, A.
Müller-Buschbaum, K.
Mai, M.
Feldmann, C.
The blue emitting luminescent MOF 3∞[Ce(Im)3ImH]·ImH forms a 3D-framework with Kagom net topology. The framework exhibits an intense blue luminescence which can be retained upon activation of the MOF with the formula 3∞[Ce(Im)3ImH]. 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 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 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.
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(2006)Doi:10.1039/f19817702277
(1981)Doi:10.1002/cssc.201802980
(2019)Doi:10.1002/1615-4169(200108)343:6/7<587::AID-ADSC587>3.0.CO;2-V
(2001)Doi:10.1021/jo00106a012
(1995)