Mesoporous thin films of ``molecular squares'' as sensors for volatile organic compounds
Mesoporous thin films of rhenium-based molecular squares, [Re(CO){sub 3}Cl(L)]{sub 4} (L = pyrazine, 4,4{prime}-bipyridine), have been utilized as sensors for volatile organic compounds (VOCs). The sensing was conducted using a quartz crystal microbalance with the target compounds present in the gas phase at concentrations ranging from 0.05 to 1 mM. Quartz crystal microbalance studies with these materials allowed for distinction between the following VOCs: (1) small aromatic versus aliphatic molecules of almost identical size and volatility and (2) an array of benzene molecules derivatized with electron donating/withdrawing substituents. The experiments suggest that the mesoporous host materials interact with VOC guest molecules through both van der Waals and weak charge-transfer interactions. In addition, size selectivity is shown by exposure of the molecular squares to cyclic ethers of differing size.
- Research Organization:
- Northwestern Univ., Evanston, IL (US)
- OSTI ID:
- 20075536
- Journal Information:
- Langmuir, Vol. 16, Issue 8; Other Information: PBD: 18 Apr 2000; ISSN 0743-7463
- Country of Publication:
- United States
- Language:
- English
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