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PHOTOCHEMISTRY IN THE MICROWAVE FIELD (MICROWAVE PHOTOCHEMISTRY) |
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Staff: |
Vladimír Církva, Stanislav Relich, Hana Žabová, Leona Vlková |
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Co-workers: |
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External co-workers: |
Petr Klán (Masaryk University in Brno, Faculty of Natural Science, Department of Organic chemistry) |
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Financing, funding: |
GACR (104/06/0992) Preparation of the electrodeless discharge lamps for photochemical applications
The project is concerning on preparation of the electrodeless discharge lamps (EDLs) as suitable source of UV/VIS light for photochemical reactions. The EDL consists of a glass tube filled under a lower pressure with an inert gas and an excitable (filling) substance, i.e. mercury or other element, and generates UV/VIS radiation when placed into the microwave field. The utilization of other filling materials than mercury (i.e. sulfur) will be practical, new, original and environmental-safety in the EDL performance, according to our preliminary research. The effect of operating EDL parameters (i.e. mass and chemical form of the filling material, nature and pressure of filling gas), the microwave power output and medium properties (i.e. transmittance, polarity, boiling point) on spectral characteristics (relative intensity vs. wavelength) will be studied. The prepared EDLs with suitable operating parameters and spectral characteristics will be applied for selected photochemical (cis-trans photoisomerization of stilbene derivates) and photocatalytical (titanium oxide) reactions, according to the required absorption output. The results of the project will be exploitable in the synthetic organic photochemistry as well as in environmental applications (i.e. photodegradation of the persistent organic pollutants, PCB, PCP, PCDD/PCDF). |
What is the microwave photochemistry?
Microwave photochemistry is concerned in the study of combined influence of UV/VIS and microwave radiation on the chemical and physical properties of molecules.
Solved problems:
Investigation is oriented on the effect of microwave radiation on the course of the selected photochemical reactions, and as from point of view to influece its regioselectivity and mechanism or as reason for development of equipment for this new experimental technique.
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Effect of microwave and UV/VIS radiation on photochemical reactions
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Synthetic photochemical application of electrodeless discharge lamps
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Development of equipments for microwave photochemistry
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What are utilizations?
The obtained results will have considerable meaning as for extending scientific knowledge and as for applying in industrial photochemical proceses or degradation methods of undesirable environmental pollutants.
Publications:
[1] Církva, V.; Hájek, M.: J. Photochem. Photobiol. A 123 (1999) 21-23. Microwave photochemistry. Photoinitiated radical addition of tetrahydrofuran to perfluorohexylethene under microwave irradiation.
[2] Klán, P.; Hájek, M.; Církva, V.: J. Photochem. Photobiol. A 140 (2001) 185-189. The electrodeless discharge lamp: a prospective tool for photochemistry. Part 3. The microwave photochemistry reactor.
[3] Klán, P.; Církva, V.: Microwave Photochemistry. In Microwaves in Organic Synthesis, Chap. 14. (Loupy, A., Ed.), pp. 463-486, John Wiley, Weinheim 2002.
[4] Církva, V.; Kurfürstová, J.; Hájek, M.: Chem. Listy 96 (2002) 939. Fotochemie v mikrovlnné troubě. (Photochemistry in microwave oven)
[5] Církva, V.; Kurfürstová, J.; Karban, J.; Hájek, M.: Chem. Listy 97 (2003) 1099. Mikrovlnná fotochemie 2- a 4-terc-butylfenolů. (Microwave photochemistry of 2- and 4-terc-butylphenols)
[6] Církva, V.; Kurfürstová, J.; Karban, J.; Hájek, M.: J. Photochem. Photobiol. A 168 (2004) 197-204. Microwave photochemistry II. Photochemistry of 2-tert-butylphenol.
[7] Církva, V.; Kurfürstová, J.; Karban, J.; Hájek, M.: J. Photochem. Photobiol. A 174 (2005) 38-44. Microwave photochemistry III. Photochemistry of 4-tert-butylphenol.
[8] Církva V.: Microwave Photochemistry. 1st Avogadro Symposium Quo Vadis Chemistry ?, Sorisole, Italy, 9-11 September 2005.
[9] Klán, P., Církva, V.: Microwaves in Photochemistry. In: Microwaves in Organic Synthesis. (Loupy, A., Ed.), pp. 860-897, WILEY-VCH Verlag, Weinheim, 2006 (ISBN 3-527-31452-0).
[10] Církva, V.: Photochemistry in the Microwave Oven. 3rd International Conference on Microwave Chemistry, Book of Abstracts, p. OC-4, Brno, Czech Republic, 03-07 September 2006.
[11] Relich, S., Církva, V., Vlková, L., Hájek, M.: Photochemistry in the Microwave Oven: Preparation, Evaluation and Applications of the Electrodeless Discharge Lamps. 3rd International Conference on Microwave Chemistry, Book of Abstracts, p. PO-21, Brno, Czech Republic, 03-07 September 2006.
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