Diffuse reflectance laser-flash photolytic study of aromatic ketones within calixarene solid matrices

Supramolecular Chemistry

Volumn 10, Issue 2, 1998, Pages 91-95

  Barra, Mónica ^a   Agha, Kazim A ^a  

^a UNIVERSITY OF WATERLOO   (Canada)

Author keywords

Aromatic ketones; Calixarenes; Laser flash photolysis

Indexed keywords

EID: 0032259013     PISSN: 10610278     EISSN: None     Source Type: Journal    
DOI: 10.1080/10610279808055399     Document Type: Article

References (14)

1. Kalyanasundaram, K. (1987). Photochemistry in microheterogeneous systems; Academic Press, Inc.: Orlando.
2. Ramamurthy, V. (Ed.) (1991). Photochemistry in organized and constrained media; VCH Publishers, Inc.: New York.
3. Vicens, J. and Böhmer, V. (Eds.) (1991). Calixarenes: a versatile class of macrocyclic compounds; Kluwer Academic Publishers: Dordrecht, The Netherlands, 3.
4. Wilkinson, F. and Kelly, G. (1989). In Handbook of organic photochemistry; Scaiano, J. C. (Ed.) CRC Press: Boca Raton, 1, 293.
5. Benzophenone (BDH), xanthone, and p-t-butylcalix[6]arene (Aldrich) were recrystallized before use. Hexa-t-butyl-37,38,39,40,41,42-hexaethoxycalix[6]arene was prepared according to: Gutsche, C. D. and Lin, L.-G. (1986). Tetrahedron, 42, 1633.
6. Ketone/calixarene solid samples were prepared by slow solvent evaporation of solutions, in either chloroform or dichloromethane (Omnisolv), containing the corresponding guest compound and calixarene (in 1:1 or 1:2 molar ratio). Laser experiments were carried out using a Nd/YAG laser (Continuum, Surelite I-10) operated at 355 nm (4-6ns pulses, < 50mJ/pulse) for excitation. Solid samples, contained in quartz cells constructed of 3 mm × 7 mm Suprasil tubing, were shaken after every laser pulse to ensure the irradiation of fresh portions of sample by each laser pulse. The time-resolved diffuse reflectance laser-flash photolysis system is controlled by a Power Mac 7100/80 computer running LabVIEVV 3.1.1 software from National Instruments. Further details on this system are reported elsewhere [Barra, M. and Agha, K. A. (1997). J. Photochem. Photobiol; A: Chem., 109, 293]. All measurements were done at room temperature.
7. Scaiano, J. C. (1980). J. Am. Chem. Soc., 102, 7747.
8. Batley, M. and Kearns, D. R. (1968). Chem. Phys. Lett., 2, 423.
9. Scaiano, J. C. (1973/74). J. Photochem., 2, 81.
10. Das, P. K., Encimas, M. V. and Scaiano, J. C. (1981). J. Am. Chem. Soc., 103, 4154.
11. Steady-state irradiations were performed in a Rayonet photoreactor equipped with RPR-3500 lamps from the Southern New England Ultraviolet Co. The samples were contained in quartz cells of the same type used for laser experiments, and were shaken regularly and rotated with a "merry-go-round" apparatus.
12. Fittings of triplet decay traces were carried out by using the general curve fitting procedure of Kaleidagraph 3.0.5 software from Synergy Software.
13. Liang, T-M. and Laali, K. K. (1991). Chem. Ber., 124, 2637-40.
14. Spectra were recorded at room temperature with a Bruker AMX-500 instrument.