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Article: Solvation effects on the A-band photodissociation of dibromomethane: Turning a photodissociation into a photoisomerization

TitleSolvation effects on the A-band photodissociation of dibromomethane: Turning a photodissociation into a photoisomerization
Authors
Issue Date2000
PublisherAmerican Chemical Society. The Journal's web site is located at http://pubs.acs.org/jpca
Citation
Journal Of Physical Chemistry A, 2000, v. 104 n. 45, p. 10464-10470 How to Cite?
AbstractWe have obtained A-band resonance Raman spectra of dibromomethane in the gas and solution phase and nanosecond time-resolved resonance Raman spectra of dibromomethane photoproducts. The A-band resonance Raman spectra suggest the short-time dynamics are similar to other dihalomethanes that are known to have direct photodissociation reactions in the gas phase. Several power dependent A-band resonance Raman bands were tentatively assigned to the C - Br stretch overtone progression of the CH 2Br radical which has a strong absorption band that is coincident with the A-band resonance Raman excitation wavelength. Two-color nanosecond time-resolved resonance Raman spectra (266.0 nm pump/341.5 nm probe) were obtained and comparison of the vibrational frequencies to the results for density functional theory calculations indicate that the iso-CH 2Br - Br species is mainly responsible for the transient photoproduct absorption band ∼360 nm. Our preliminary results for A-band photoexcitation of dibromomethane in conjunction with previously reported diiodomethane results suggest that solvation effects (probably via recombination of the CH 2Br and Br fragments within a solvent cage) lead to noticeable production of the isodibromomethane photoisomerization photoproduct observed in the nanosecond time-resolved resonance Raman spectra. © 2000 American Chemical Society.
Persistent Identifierhttp://hdl.handle.net/10722/69000
ISSN
2015 Impact Factor: 2.883
2015 SCImago Journal Rankings: 1.231
References

 

DC FieldValueLanguage
dc.contributor.authorZheng, Xen_HK
dc.contributor.authorKwok, WMen_HK
dc.contributor.authorPhillips, DLen_HK
dc.date.accessioned2010-09-06T06:09:38Z-
dc.date.available2010-09-06T06:09:38Z-
dc.date.issued2000en_HK
dc.identifier.citationJournal Of Physical Chemistry A, 2000, v. 104 n. 45, p. 10464-10470en_HK
dc.identifier.issn1089-5639en_HK
dc.identifier.urihttp://hdl.handle.net/10722/69000-
dc.description.abstractWe have obtained A-band resonance Raman spectra of dibromomethane in the gas and solution phase and nanosecond time-resolved resonance Raman spectra of dibromomethane photoproducts. The A-band resonance Raman spectra suggest the short-time dynamics are similar to other dihalomethanes that are known to have direct photodissociation reactions in the gas phase. Several power dependent A-band resonance Raman bands were tentatively assigned to the C - Br stretch overtone progression of the CH 2Br radical which has a strong absorption band that is coincident with the A-band resonance Raman excitation wavelength. Two-color nanosecond time-resolved resonance Raman spectra (266.0 nm pump/341.5 nm probe) were obtained and comparison of the vibrational frequencies to the results for density functional theory calculations indicate that the iso-CH 2Br - Br species is mainly responsible for the transient photoproduct absorption band ∼360 nm. Our preliminary results for A-band photoexcitation of dibromomethane in conjunction with previously reported diiodomethane results suggest that solvation effects (probably via recombination of the CH 2Br and Br fragments within a solvent cage) lead to noticeable production of the isodibromomethane photoisomerization photoproduct observed in the nanosecond time-resolved resonance Raman spectra. © 2000 American Chemical Society.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.titleSolvation effects on the A-band photodissociation of dibromomethane: Turning a photodissociation into a photoisomerizationen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1089-5639&volume=104&issue=45&spage=10464&epage=10470&date=2000&atitle=Solvation+Effects+on+the+A-Band+Photodissociation+of+Dibromomethane:++Turning+a+Photodissociation+into+a+Photoisomerizationen_HK
dc.identifier.emailPhillips, DL:phillips@hku.hken_HK
dc.identifier.authorityPhillips, DL=rp00770en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/jp001168%2B-
dc.identifier.scopuseid_2-s2.0-0034319383en_HK
dc.identifier.hkuros62394en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0034319383&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume104en_HK
dc.identifier.issue45en_HK
dc.identifier.spage10464en_HK
dc.identifier.epage10470en_HK
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridZheng, X=7404090253en_HK
dc.identifier.scopusauthoridKwok, WM=7103129332en_HK
dc.identifier.scopusauthoridPhillips, DL=7404519365en_HK

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