File Download
There are no files associated with this item.
Links for fulltext
(May Require Subscription)
- Publisher Website: 10.1021/jp506099n
- Scopus: eid_2-s2.0-84907452578
- PMID: 25134065
- WOS: WOS:000342396100007
- Find via
Supplementary
- Citations:
- Appears in Collections:
Article: Time-Resolved Spectroscopic and Density Functional Theory Study of the Photochemistry of Irgacure-2959 in an Aqueous Solution
Title | Time-Resolved Spectroscopic and Density Functional Theory Study of the Photochemistry of Irgacure-2959 in an Aqueous Solution |
---|---|
Authors | |
Issue Date | 2014 |
Publisher | American Chemical Society. The Journal's web site is located at http://pubs.acs.org/jpca |
Citation | The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 2014, v. 118 n. 38, p. 8701–8707 How to Cite? |
Abstract | The photocleavage reaction mechanism of 2-hydroxy-4´-(2-hydroxyethoxy)-2-methylpropiophenone (Irgacure-2959) was investigated using femtosecond (fs) and nanosecond (ns) transient absorption (-TA) spectroscopy and also picosecond (ps) and nanosecond (ns) time-resolved resonance Raman (-TR3) spectroscopy experiments in a water-rich (volume ratio of acetonitrile:water=3:7) solution. TA spectroscopy was used to study the dynamics of the benzoyl radical growth and decay as well as to investigate the radical quenching process by the radical scavenger methyl acrylate. Ps- and ns-TR3 spectroscopies were employed to monitor the formation of the benzoyl radical and also to characterize its electronic and structural properties. The fs-TA experiments results indicate that the Irgacure-2959 lowest lying excited singlet state S1 underwent efficient intersystem crossing (ISC) to convert into its triplet state with a time constant of 4 ps. Subsequently, this triplet species dissociated into the benzoyl and alkyl radicals with a corresponding maximum absorption band at 415 nm. The TR3 results in conjunction with results from DFT calculations confirmed that Irgacure-2959 cleaved into the benzoyl and alkyl radicals at a fast rate on the tens of picosecond timescale. Time-Resolved Spectroscopic and Density Functional Theory Study of the Photochemistry of Irgacure-2959 in an Aqueous Solution (PDF Download Available). Available from: http://www.researchgate.net/publication/264865803_Time-Resolved_Spectroscopic_and_Density_Functional_Theory_Study_of_the_Photochemistry_of_Irgacure-2959_in_an_Aqueous_Solution [accessed Jul 2, 2015]. |
Persistent Identifier | http://hdl.handle.net/10722/211708 |
ISSN | 2023 Impact Factor: 2.7 2023 SCImago Journal Rankings: 0.604 |
ISI Accession Number ID |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Liu, M | - |
dc.contributor.author | Li, MD | - |
dc.contributor.author | Xue, J | - |
dc.contributor.author | Phillips, DL | - |
dc.date.accessioned | 2015-07-21T02:08:34Z | - |
dc.date.available | 2015-07-21T02:08:34Z | - |
dc.date.issued | 2014 | - |
dc.identifier.citation | The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory, 2014, v. 118 n. 38, p. 8701–8707 | - |
dc.identifier.issn | 1089-5639 | - |
dc.identifier.uri | http://hdl.handle.net/10722/211708 | - |
dc.description.abstract | The photocleavage reaction mechanism of 2-hydroxy-4´-(2-hydroxyethoxy)-2-methylpropiophenone (Irgacure-2959) was investigated using femtosecond (fs) and nanosecond (ns) transient absorption (-TA) spectroscopy and also picosecond (ps) and nanosecond (ns) time-resolved resonance Raman (-TR3) spectroscopy experiments in a water-rich (volume ratio of acetonitrile:water=3:7) solution. TA spectroscopy was used to study the dynamics of the benzoyl radical growth and decay as well as to investigate the radical quenching process by the radical scavenger methyl acrylate. Ps- and ns-TR3 spectroscopies were employed to monitor the formation of the benzoyl radical and also to characterize its electronic and structural properties. The fs-TA experiments results indicate that the Irgacure-2959 lowest lying excited singlet state S1 underwent efficient intersystem crossing (ISC) to convert into its triplet state with a time constant of 4 ps. Subsequently, this triplet species dissociated into the benzoyl and alkyl radicals with a corresponding maximum absorption band at 415 nm. The TR3 results in conjunction with results from DFT calculations confirmed that Irgacure-2959 cleaved into the benzoyl and alkyl radicals at a fast rate on the tens of picosecond timescale. Time-Resolved Spectroscopic and Density Functional Theory Study of the Photochemistry of Irgacure-2959 in an Aqueous Solution (PDF Download Available). Available from: http://www.researchgate.net/publication/264865803_Time-Resolved_Spectroscopic_and_Density_Functional_Theory_Study_of_the_Photochemistry_of_Irgacure-2959_in_an_Aqueous_Solution [accessed Jul 2, 2015]. | - |
dc.language | eng | - |
dc.publisher | American Chemical Society. The Journal's web site is located at http://pubs.acs.org/jpca | - |
dc.relation.ispartof | The Journal of Physical Chemistry Part A: Molecules, Spectroscopy, Kinetics, Environment and General Theory | - |
dc.title | Time-Resolved Spectroscopic and Density Functional Theory Study of the Photochemistry of Irgacure-2959 in an Aqueous Solution | - |
dc.type | Article | - |
dc.identifier.email | Li, MD: mdli@hku.hk | - |
dc.identifier.email | Phillips, DL: phillips@hku.hk | - |
dc.identifier.authority | Phillips, DL=rp00770 | - |
dc.identifier.doi | 10.1021/jp506099n | - |
dc.identifier.pmid | 25134065 | - |
dc.identifier.scopus | eid_2-s2.0-84907452578 | - |
dc.identifier.hkuros | 244755 | - |
dc.identifier.volume | 118 | - |
dc.identifier.issue | 38 | - |
dc.identifier.spage | 8701 | - |
dc.identifier.epage | 8707 | - |
dc.identifier.isi | WOS:000342396100007 | - |
dc.publisher.place | United States | - |
dc.identifier.issnl | 1089-5639 | - |