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Charge-transfer guest interactions in luminescent MOFs: implications for solid-state temperature and environmental
Patrick L Feng1, Kirsty Leong, Mark D Allendorf
1Sandia National Laboratories, 7011 East Avenue, Livermore, CA 94550, USA. plfeng@sandia.gov
Dalton Transactions (Cambridge, England : 2003)
|June 19, 2012
Summary
Researchers developed new aluminum-based metal-organic frameworks (MOFs) for sensing applications. These MOFs form luminescent charge-transfer complexes with amines, showing potential for detecting temperature and solvent polarity changes.
Area of Science:
- Materials Science
- Chemistry
- Nanotechnology
Background:
- Designing porous materials for sensing is a key goal in materials science.
- Aluminum-based metal-organic frameworks (MOFs) offer tunable structures for various applications.
Purpose of the Study:
- To synthesize and characterize aluminum-based MOFs with potential sensing capabilities.
- To investigate the luminescence and environmental sensing properties of modified MOFs.
Main Methods:
- Preparation and activation of aluminum-based MOF variants.
- Spectroscopic analysis (steady-state and time-resolved luminescence) to study charge-transfer complexes.
- Investigating responses to temperature and solvent polarity changes.
Main Results:
- A structural transformation occurred upon activation, leading to altered luminescence.
- Formation of luminescent ground-state charge-transfer (CT) complexes with dimethylamine (DMA) and N,N-diethylaniline (DEA).
- These complexes exhibited dual-emission and ratiometric responses sensitive to temperature and solvent polarity.
Conclusions:
- The MOF structures effectively stabilize ground-state CT interactions.
- The observed temperature and solvent polarity dependencies suggest potential for MOF-based sensor applications.
- These materials demonstrate promise for environmental monitoring and chemical sensing.
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