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Article: Picosecond time-resolved resonance Raman study of CH2I-I produced after ultraviolet photolysis of CH2I2 in CH3OH, CH3CN/H2O and CH3OH/H2O solutions

TitlePicosecond time-resolved resonance Raman study of CH2I-I produced after ultraviolet photolysis of CH2I2 in CH3OH, CH3CN/H2O and CH3OH/H2O solutions
Authors
Issue Date2003
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/jpca
Citation
Journal Of Physical Chemistry A, 2003, v. 107 n. 15, p. 2624-2628 How to Cite?
AbstractWe present picosecond time-resolved resonance Raman spectroscopy experiments investigating the photo-products produced after ultraviolet photolysis of CH2I2 in CH3OH solution and in 50% CH3OH/50% H2O and 50% CH3CN/50% H2O by volume mixed solvents. We observe that isodiiodomethane (CH2I-I) is formed within several picoseconds and has a lifetime that significantly depends on the solvent system (time constant of 3.8 ns in CH3OH, 1.8 ns in 50% CH3CN/50% H2O, and 0.8 ns in 50% CH3OH/50% H2O). Our results indicate that CH2I-I can be formed via geminate recombination in aqueous environments but will have a shorter lifetime than in previous experiments done in several organic solvents. The variations in the lifetime of CH2I-I in the presence of H2O and CH3OH could be due to its chemical reaction with the O-H bond and/or possibly faster cleavage of the weak I-I bond in aqueous solutions. We briefly discuss the potential role of CH2I-I in the release of reactive halogens in aqueous environments.
Persistent Identifierhttp://hdl.handle.net/10722/70296
ISSN
2015 Impact Factor: 2.883
2015 SCImago Journal Rankings: 1.231
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorKwok, WMen_HK
dc.contributor.authorMa, Cen_HK
dc.contributor.authorParker, AWen_HK
dc.contributor.authorPhillips, Den_HK
dc.contributor.authorTowrie, Men_HK
dc.contributor.authorMatousek, Pen_HK
dc.contributor.authorLee Phillips, Den_HK
dc.date.accessioned2010-09-06T06:21:32Z-
dc.date.available2010-09-06T06:21:32Z-
dc.date.issued2003en_HK
dc.identifier.citationJournal Of Physical Chemistry A, 2003, v. 107 n. 15, p. 2624-2628en_HK
dc.identifier.issn1089-5639en_HK
dc.identifier.urihttp://hdl.handle.net/10722/70296-
dc.description.abstractWe present picosecond time-resolved resonance Raman spectroscopy experiments investigating the photo-products produced after ultraviolet photolysis of CH2I2 in CH3OH solution and in 50% CH3OH/50% H2O and 50% CH3CN/50% H2O by volume mixed solvents. We observe that isodiiodomethane (CH2I-I) is formed within several picoseconds and has a lifetime that significantly depends on the solvent system (time constant of 3.8 ns in CH3OH, 1.8 ns in 50% CH3CN/50% H2O, and 0.8 ns in 50% CH3OH/50% H2O). Our results indicate that CH2I-I can be formed via geminate recombination in aqueous environments but will have a shorter lifetime than in previous experiments done in several organic solvents. The variations in the lifetime of CH2I-I in the presence of H2O and CH3OH could be due to its chemical reaction with the O-H bond and/or possibly faster cleavage of the weak I-I bond in aqueous solutions. We briefly discuss the potential role of CH2I-I in the release of reactive halogens in aqueous environments.en_HK
dc.languageengen_HK
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/jpcaen_HK
dc.relation.ispartofJournal of Physical Chemistry Aen_HK
dc.titlePicosecond time-resolved resonance Raman study of CH2I-I produced after ultraviolet photolysis of CH2I2 in CH3OH, CH3CN/H2O and CH3OH/H2O solutionsen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1089-5639&volume=107&issue=15&spage=2624&epage=2628&date=2003&atitle=Picosecond+time-resolved+resonance+raman+study+of+CH2I-I+produced+after+ultraviolet+photolysis+of+CH2I2+in+CH3OH,+CH3CN/H2O+and+CH3OH/H2O+solutionsen_HK
dc.identifier.emailMa, C:macs@hkucc.hku.hken_HK
dc.identifier.emailPhillips, D:phillips@hku.hken_HK
dc.identifier.emailLee Phillips, D:phillips@hku.hken_HK
dc.identifier.authorityMa, C=rp00758en_HK
dc.identifier.authorityPhillips, D=rp00770en_HK
dc.identifier.authorityLee Phillips, D=rp00770en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/jp021611ben_HK
dc.identifier.scopuseid_2-s2.0-0037451971en_HK
dc.identifier.hkuros80981en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0037451971&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume107en_HK
dc.identifier.issue15en_HK
dc.identifier.spage2624en_HK
dc.identifier.epage2628en_HK
dc.identifier.isiWOS:000182167100004-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridKwok, WM=7103129332en_HK
dc.identifier.scopusauthoridMa, C=7402924979en_HK
dc.identifier.scopusauthoridParker, AW=7403267977en_HK
dc.identifier.scopusauthoridPhillips, D=7404519365en_HK
dc.identifier.scopusauthoridTowrie, M=7004415080en_HK
dc.identifier.scopusauthoridMatousek, P=7005659005en_HK
dc.identifier.scopusauthoridLee Phillips, D=7404519365en_HK

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