Journal
CHEMISTRY-A EUROPEAN JOURNAL
Volume 19, Issue 47, Pages 15964-15971Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/chem.201301194
Keywords
aromatics; detection; explosives; luminescence; metal-organic framework; sensing
Categories
Funding
- National Science Foundation [DMR-1206700]
- China Scholarship Council
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1206700] Funding Source: National Science Foundation
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A systematic study is conducted on four microporous metal-organic framework compounds built on similar ligands but different structures, namely [Zn-3(bpdc)(3)(bpy)]4DMFH(2)O (1), [Zn-3(bpdc)(3)(2,2dmbpy)]4DMF H2O (2), [Zn-2(bpdc)(2)(bpe)]2DMF (3), and [Zn(bpdc)(bpe)]DMF (4) (bpdc=4,4-biphenyldicarboxylate; bpy=4,4-bipyridine; 2,2dmbpy=2,2-dimethyl-4,4bipyridine; bpe=1,2-bis(4-pyridyl)ethane; DMF=N,N-dimethylformamide) to investigate their photoluminescence properties and sensing/detection behavior upon exposure to vapors of various aromatic molecules (analytes) including nitroaromatic explosives. The results show that all four compounds are capable of detecting these molecules in the vapor phase through fluorescence quenching or enhancement. Both electrochemical measurements and theoretical calculations are performed to analyze the analyte-MOF interactions, to explain the difference in signal response by different analytes, and to understand the mechanism of fluorescence quenching or enhancement observed in these systems. Interestingly, compound 3 also shows an emission frequency shift when exposed to benzene (BZ), chlorobenzene (ClBZ), and toluene (TO), which provides an additional variable for the identification of different analytes in the same category.
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