Triplet behavior in weakly coupled chromophors in covalent pyridyl porphyrin-polymer systems |
| |
| Authors: | Aleksandra Siejak, Danuta Wr bel, Barbara Laskowska,Yuri S. Avlasevich |
| |
| Affiliation: | aInstitute of Physics, Poznan University of Technology, Nieszawska 13A, 60-965 Poznań, Poland;bInstitute of Molecular Physics, Polish Academy of Sciences, Smoluchowskiego 17, 60-179 Poznań, Poland;cMax Planck Institute for Polymer Research, Ackermannweg 10, 55128 Mainz, Germany |
| |
| Abstract: | The photophysical properties of the 5-(4-pyridyl)-10,15,20-tri(4-methyloxyphenyl)porphyrins covalently linked to polyethylene glycol – PEG of different molecular weights (35000, 20000 and 8000) dissolved in dimethylsulfoxide were studied. The singlet and triplet states of the porphyrin species behavior were discussed in terms of fluorescence and thermal relaxation processes. The absorption, fluorescence and photothermal experiments showed that in the porphyrins linked to the PEG systems in dimethylsulfoxide the dye moieties occur in weakly interacting dimers. The triplet state enhancement in the 5-(4-pyridyl)-10,15,20-tri(4-methyloxyphenyl)porphyrins covalently linked to PEG was discussed.It was shown that even that the weak interaction of the porphyrin species in the covalent systems with PEG is not detectable by the absorption and only slightly by fluorescence, it is possible to be performed by the complementary spectroscopic methods like photoacoustics and photothermal time resolved spectroscopy. |
| |
| Keywords: | Porphyrin covalently linked to polymer Absorption spectroscopy Fluorescence spectroscopy Photothermal spectroscopy Triplet enhancement Weak aggregate |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
