Photochemical reactivity of zinc tetraphenylporphyrin induced by nonstoichiometric CdS nanoparticles in 2-propanol
The photoreactivity of zinc tetraphenylporphyrin (ZnTPP) in the presence of photoexcited CdS nanoparticles and molecular oxygen in 2-propanol has been revisited. The photodecomposition of ZnTPP in 2-propanol, in the presence of CdS(e-CB/h+VB) and molecular oxygen, is linked to isopropyl free radical...
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| Format: | Article |
| Language: | English |
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Wiley
2001-01-01
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| Series: | International Journal of Photoenergy |
| Online Access: | http://dx.doi.org/10.1155/S1110662X01000022 |
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| author | Alex V. Isarov John Chrysochoos |
| author_facet | Alex V. Isarov John Chrysochoos |
| author_sort | Alex V. Isarov |
| collection | DOAJ |
| description | The photoreactivity of zinc tetraphenylporphyrin (ZnTPP) in the presence of photoexcited CdS
nanoparticles and molecular oxygen in 2-propanol has been revisited. The photodecomposition of ZnTPP in
2-propanol, in the presence of CdS(e-CB/h+VB) and molecular oxygen, is linked to isopropyl free radicals
formed by both hole transfer from CdS(h+VB) to (CH3)2CHOH and the reaction of superoxide ion (O2−) with 2-propanol. Isopropyl free radicals react with ZnTPP, leading to the formation of ZnTPP•−. Intermediate
paramagnetic species monitored by EPR spectroscopy (g=2.0029,ΔH=5.7G) were characterized as superoxides
formed in the reaction of ZnTPP•− with O2. Further transformations of such EPR-active species lead
to the formation of diamagnetic intermediate photoproducts of ZnTPP observed by absorption and emission
spectroscopy. |
| format | Article |
| id | doaj-art-4ff4a96460334d45aea90ff403b1c1da |
| institution | Kabale University |
| issn | 1110-662X |
| language | English |
| publishDate | 2001-01-01 |
| publisher | Wiley |
| record_format | Article |
| series | International Journal of Photoenergy |
| spelling | doaj-art-4ff4a96460334d45aea90ff403b1c1da2025-02-03T01:07:20ZengWileyInternational Journal of Photoenergy1110-662X2001-01-0131172310.1155/S1110662X01000022Photochemical reactivity of zinc tetraphenylporphyrin induced by nonstoichiometric CdS nanoparticles in 2-propanolAlex V. Isarov0John Chrysochoos1Department of Chemistry, The University of Toledo, Toledo, Ohio 43606, USADepartment of Chemistry, The University of Toledo, Toledo, Ohio 43606, USAThe photoreactivity of zinc tetraphenylporphyrin (ZnTPP) in the presence of photoexcited CdS nanoparticles and molecular oxygen in 2-propanol has been revisited. The photodecomposition of ZnTPP in 2-propanol, in the presence of CdS(e-CB/h+VB) and molecular oxygen, is linked to isopropyl free radicals formed by both hole transfer from CdS(h+VB) to (CH3)2CHOH and the reaction of superoxide ion (O2−) with 2-propanol. Isopropyl free radicals react with ZnTPP, leading to the formation of ZnTPP•−. Intermediate paramagnetic species monitored by EPR spectroscopy (g=2.0029,ΔH=5.7G) were characterized as superoxides formed in the reaction of ZnTPP•− with O2. Further transformations of such EPR-active species lead to the formation of diamagnetic intermediate photoproducts of ZnTPP observed by absorption and emission spectroscopy.http://dx.doi.org/10.1155/S1110662X01000022 |
| spellingShingle | Alex V. Isarov John Chrysochoos Photochemical reactivity of zinc tetraphenylporphyrin induced by nonstoichiometric CdS nanoparticles in 2-propanol International Journal of Photoenergy |
| title | Photochemical reactivity of zinc tetraphenylporphyrin induced by nonstoichiometric CdS nanoparticles in 2-propanol |
| title_full | Photochemical reactivity of zinc tetraphenylporphyrin induced by nonstoichiometric CdS nanoparticles in 2-propanol |
| title_fullStr | Photochemical reactivity of zinc tetraphenylporphyrin induced by nonstoichiometric CdS nanoparticles in 2-propanol |
| title_full_unstemmed | Photochemical reactivity of zinc tetraphenylporphyrin induced by nonstoichiometric CdS nanoparticles in 2-propanol |
| title_short | Photochemical reactivity of zinc tetraphenylporphyrin induced by nonstoichiometric CdS nanoparticles in 2-propanol |
| title_sort | photochemical reactivity of zinc tetraphenylporphyrin induced by nonstoichiometric cds nanoparticles in 2 propanol |
| url | http://dx.doi.org/10.1155/S1110662X01000022 |
| work_keys_str_mv | AT alexvisarov photochemicalreactivityofzinctetraphenylporphyrininducedbynonstoichiometriccdsnanoparticlesin2propanol AT johnchrysochoos photochemicalreactivityofzinctetraphenylporphyrininducedbynonstoichiometriccdsnanoparticlesin2propanol |