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Article: Photoisomerization reaction of CH2BrI following A-band and B-band photoexcitation in the solution phase: Transient resonance Raman observation of the iso-CH2I–Br photoproduct

TitlePhotoisomerization reaction of CH2BrI following A-band and B-band photoexcitation in the solution phase: Transient resonance Raman observation of the iso-CH2I–Br photoproduct
Authors
KeywordsPhysics chemistry
Issue Date2000
PublisherAmerican Institute of Physics. The Journal's web site is located at http://jcp.aip.org/jcp/staff.jsp
Citation
Journal of Chemical Physics, 2000, v. 113 n. 8, p. 3194-3203 How to Cite?
AbstractWe present nanosecond transient resonance Raman experiments that investigate the photoproduct species formed following A-band and B-band excitation of bromoiodomethane in room temperature cyclohexane solutions. Density functional theory calculations were also performed for several species that have been proposed as photoproducts for photodissociation of bromoiodomethane in the condensed phase. Comparison of the experimental resonance Raman spectra to density functional theory computational results and results for the closely related iso-CH2I–I and iso-CH2Br–Br species demonstrated that the iso-CH2I–Br species is mainly responsible for a transient absorption spectrum that appears after either A-band or B-band photoexcitation of bromoiodomethane in cyclohexane solution. This is in contrast to previous results for low temperature (12 K) solids where mainly the iso-CH2Br–I species was observed following A-band photoexcitation of bromoiodomethane. Further density functional theory computational results indicate that the iso-CH2I–Br species is noticeably more stable than the iso-CH2Br–I species by about 4.1 kcal/mol. This suggests that although both iso-CH2I–Br and iso-CH2Br–I species may be initially produced following ultraviolet excitation of bromoiodomethane in cyclohexane solution, only the more stable isomer has a sufficiently long lifetime to be observed in our nanosecond time-scale transient resonance Raman experiments. We compare results for the bromoiodomethane ultraviolet photodissociation/photoisomerization reactions in the condensed phase to those of the closely related diiodomethane system and discuss a probable mechanism for the formation of the iso-bromoiodomethane species in the condensed phase. © 2000 American Institute of Physics.
Persistent Identifierhttp://hdl.handle.net/10722/42350
ISSN
2015 Impact Factor: 2.894
2015 SCImago Journal Rankings: 0.959
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZheng, Xen_HK
dc.contributor.authorPhillips, DLen_HK
dc.date.accessioned2007-01-29T08:47:32Z-
dc.date.available2007-01-29T08:47:32Z-
dc.date.issued2000en_HK
dc.identifier.citationJournal of Chemical Physics, 2000, v. 113 n. 8, p. 3194-3203en_HK
dc.identifier.issn0021-9606en_HK
dc.identifier.urihttp://hdl.handle.net/10722/42350-
dc.description.abstractWe present nanosecond transient resonance Raman experiments that investigate the photoproduct species formed following A-band and B-band excitation of bromoiodomethane in room temperature cyclohexane solutions. Density functional theory calculations were also performed for several species that have been proposed as photoproducts for photodissociation of bromoiodomethane in the condensed phase. Comparison of the experimental resonance Raman spectra to density functional theory computational results and results for the closely related iso-CH2I–I and iso-CH2Br–Br species demonstrated that the iso-CH2I–Br species is mainly responsible for a transient absorption spectrum that appears after either A-band or B-band photoexcitation of bromoiodomethane in cyclohexane solution. This is in contrast to previous results for low temperature (12 K) solids where mainly the iso-CH2Br–I species was observed following A-band photoexcitation of bromoiodomethane. Further density functional theory computational results indicate that the iso-CH2I–Br species is noticeably more stable than the iso-CH2Br–I species by about 4.1 kcal/mol. This suggests that although both iso-CH2I–Br and iso-CH2Br–I species may be initially produced following ultraviolet excitation of bromoiodomethane in cyclohexane solution, only the more stable isomer has a sufficiently long lifetime to be observed in our nanosecond time-scale transient resonance Raman experiments. We compare results for the bromoiodomethane ultraviolet photodissociation/photoisomerization reactions in the condensed phase to those of the closely related diiodomethane system and discuss a probable mechanism for the formation of the iso-bromoiodomethane species in the condensed phase. © 2000 American Institute of Physics.en_HK
dc.format.extent121755 bytes-
dc.format.extent30208 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/msword-
dc.languageengen_HK
dc.publisherAmerican Institute of Physics. The Journal's web site is located at http://jcp.aip.org/jcp/staff.jspen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectPhysics chemistryen_HK
dc.titlePhotoisomerization reaction of CH2BrI following A-band and B-band photoexcitation in the solution phase: Transient resonance Raman observation of the iso-CH2I–Br photoproducten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0021-9606&volume=113&issue=8&spage=3194&epage=3203&date=2000&atitle=Photoisomerization+reaction+of+CH2BrI+following+A-band+and+B-band+photoexcitation+in+the+solution+phase:+Transient+resonance+Raman+observation+of+the+iso-CH2I–Br+photoproducten_HK
dc.identifier.emailPhillips, DL:phillips@hku.hk-
dc.identifier.authorityPhillips, DL=rp00770-
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1063/1.1286920en_HK
dc.identifier.scopuseid_2-s2.0-0034702695-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034702695&selection=ref&src=s&origin=recordpage-
dc.identifier.volume113-
dc.identifier.issue8-
dc.identifier.spage3194-
dc.identifier.epage3203-
dc.identifier.isiWOS:000088792800032-
dc.publisher.placeUnited States-
dc.identifier.scopusauthoridZheng, X=7404090253-
dc.identifier.scopusauthoridPhillips, DL=7404519365-

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