Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 22, Issue 13, Pages 4460-4468Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201504432
Keywords
cryogenic temperatures; energy transfer; fluorescence; metal-organic frameworks; ratiometric thermometer
Categories
Funding
- 973 Program [2012CB821702, 2014CB845603]
- National Natural Science Foundation of China [21233009, 21203194]
- Fujian Province [2013J05039]
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A new mixed-ligand metal-organic framework (MOF), ZnATZ-BTB, has been constructed as a luminescent ratiometric thermometer by making use of the intrinsic dual emission at cryogenic temperatures. Its twofold interpenetrated network promotes the Dexter energy transfer (DET) between the mixed organic lumophores. The temperature-dependent luminescent behavior arises from the thermal equilibrium between two separated excited states coupled by DET, which is confirmed by Boltzmann distribution fitting. The small excited-state energy gap allows ZnATZ-BTB to measure and visualize cryogenic temperatures (30-130K) with significantly high relative sensitivity (up to 5.29%K-1 at 30K). Moreover, it is the first example of a ratiometric MOF thermometer the dual emitting sources of which are widely applicable mixed organic ligands, opening up new opportunities for designing such devices.
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