| Generating singlet oxygen bubbles: a new mechanism for gas-liquid oxidations in water. | |
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MedLine Citation:
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PMID: 22260325 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Laser-coupled microphotoreactors were developed to bubble singlet oxygen [(1)O(2) ((1)Δ(g))] into an aqueous solution containing an oxidizable compound. The reactors consisted of custom-modified SMA fiberoptic receptacles loaded with 150 μm silicon phthalocyanine glass sensitizer particles, where the particles were isolated from direct contact with water by a membrane adhesively bonded to the bottom of each device. A tube fed O(2) gas to the reactor chambers. In the presence of O(2), singlet oxygen was generated by illuminating the sensitizer particles with 669 nm light from an optical fiber coupled to the top of the reactor. The generated (1)O(2) was transported through the membrane by the O(2) stream and formed bubbles in solution. In solution, singlet oxygen reacted with probe compounds (9,10-anthracene dipropionate dianion, trans-2-methyl-2-pentanoate anion, N-benzoyl-D,L-methionine, or N-acetyl-D,L-methionine) to give oxidized products in two stages. The early stage was rapid and showed that (1)O(2) transfer occurred via bubbles mainly in the bulk water solution. The later stage was slow; it arose only from (1)O(2)-probe molecule contact at the gas/liquid interface. A mechanism is proposed that involves (1)O(2) mass transfer and solvation, where smaller bubbles provide better penetration of (1)O(2) into the flowing stream due to higher surface-to-volume contact between the probe molecules and (1)O(2). |
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Authors:
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Dorota Bartusik; David Aebisher; BiBi Ghafari; Alan M Lyons; Alexander Greer |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. Date: 2012-01-20 |
Journal Detail:
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Title: Langmuir : the ACS journal of surfaces and colloids Volume: 28 ISSN: 1520-5827 ISO Abbreviation: Langmuir Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-02-07 Completed Date: 2012-07-09 Revised Date: 2013-04-11 |
Medline Journal Info:
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Nlm Unique ID: 9882736 Medline TA: Langmuir Country: United States |
Other Details:
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Languages: eng Pagination: 3053-60 Citation Subset: IM |
Affiliation:
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Department of Chemistry, Brooklyn College, City University of New York, Brooklyn, New York 11210, United States. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Gases
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chemistry Indoles / chemical synthesis, chemistry Lasers Molecular Structure Organosilicon Compounds / chemical synthesis, chemistry Oxidation-Reduction Photochemistry / instrumentation, methods Photosensitizing Agents / chemical synthesis, chemistry Singlet Oxygen / chemistry* Water / chemistry* |
| Grant Support | |
ID/Acronym/Agency:
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SC1 GM093830-02/GM/NIGMS NIH HHS; SC1GM093830/GM/NIGMS NIH HHS |
| Chemical | |
Reg. No./Substance:
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0/Gases; 0/Indoles; 0/Organosilicon Compounds; 0/Photosensitizing Agents; 135719-28-7/silicon phthalocyanine; 17778-80-2/Singlet Oxygen; 7732-18-5/Water |
| Comments/Corrections | |
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