Mesoporous Thin Films of 'Molecular Squares' as Sensors for Volatile Organic Compounds
| Autor: | Charlotte L. Stern, Robert V. Slone, Kenneth F. Czaplewski, Melinda H. Keefe, Joseph T. Hupp, Randall Q. Snurr |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Pyrazine
chemistry.chemical_element Surfaces and Interfaces Quartz crystal microbalance Rhenium Condensed Matter Physics chemistry.chemical_compound Bipyridine symbols.namesake chemistry Electrochemistry symbols Organic chemistry Physical chemistry Molecule General Materials Science van der Waals force Benzene Mesoporous material Spectroscopy |
| Zdroj: | Langmuir. 16:3964-3970 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | Mesoporous thin films of rhenium-based “molecular squares”, [Re(CO)3Cl(L)]4 (L = pyrazine, 4,4‘- 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|