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Photophysical studies of six amphiphilic 2:1 cyclodextrin:[60]fullerene derivatives
- Source :
- Chemical Physics. 325:397-403
- Publication Year :
- 2006
- Publisher :
- Elsevier BV, 2006.
-
Abstract
- In search of a simple internal complexation of C 60 in cyclodextrins, six 2:1 cyclodextrin:[60]fullerene conjugates involving different types of linkers have been synthesised. Using spectrophotometry, laser flash photolysis and pulse radiolysis, we have investigated spectroscopic and photophysical properties of these 2:1 cyclodextrin [60]fullerene monoadduct conjugates ( CDF ), including ground and triplet state absorption spectra, triplet molar absorption coefficients ( e T ), quantum yields of triplet ( Φ T ) and singlet oxygen formation ( Φ Δ ) in water and toluene, in order to probe the possibility of 2:1 inclusion complexes of C 60 between two cyclodextrins. In water, the CDF spectroscopic and photophysical properties indicate hydrophobically driven self-assemblies of the amphiphilic conjugates into spherical micelles with no evidence for the presence of a 2:1 inclusion complex, while in toluene they show no sign of aggregation. It is observed that formation of aggregates in water does not prevent scavenging of HO radical by the C 60 moiety of the CD–C 60 conjugates.
Details
- ISSN :
- 03010104
- Volume :
- 325
- Database :
- OpenAIRE
- Journal :
- Chemical Physics
- Accession number :
- edsair.doi...........59852ea4848785df5db64aa29dde7226