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Article: Direct observation of mass transfer at solid-liquid interface by laser flash photolysis of the interface probe molecules

TitleDirect observation of mass transfer at solid-liquid interface by laser flash photolysis of the interface probe molecules
Authors
Issue Date2000
PublisherAmerican Chemical Society. The Journal's web site is located at http://www.pubs.acs.org/jpcb
Citation
Journal Of Physical Chemistry B, 2000, v. 104 n. 32, p. 7713-7724 How to Cite?
AbstractTransient absorption signal delayed by a magnitude of 100 μs with respect to the exciting laser shot is observed after UV laser flash photolysis of degassed benzene, acetone, and acetonitrile solutions of an interface probe complex, i.e., gold(I) complex [{Au[P(C 6H 4OMe-p) 3]} 2-(μ-C≡C)] (μ-ethynylene-bis{tris(4-methoxyphenyl)-phosphine}gold]). Chemical reactions leading to the transient absorbance change are confirmed to be occurring at the solid-liquid interface, and the delay time is believed to arise from the photogenerated intermediate species in the bulk solution crossing the diffusion layer, which ultimately undergo interfacial reactions resulting in the observed transient absorbance change. The delay time is suggested as a direct measure for the thickness of the diffusion layer. The thickness of the diffusion layer around 0.2 μm, estimated by this method, is comparable to that from the sonovoltammetric study. Oscillations in transient absorbance kinetics are also observed, which can be attributed to the coupling between the interfacial chemical reactions and a photoacoustic effect; oscillation due to a single physical process arising from the schlieren effect under certain condition is also discussed. Similar transient phenomena are observed in another luminescent complex, i.e., a hexanuclear Cu(I) cluster Cu 6(t-NS) 6 (t-NS = 4-tert-butylpyridine-2-thiolate). The characterization of the photochemical reaction processes of the Cu(I) complex by means of transient absorbance difference spectra reveals that a consecutive biphotonic ionization process occurs after the laser flash. The intermediate species with a lifetime of 65 μs responsible for the interfacial reaction is tentatively assigned as a charge separation pair. A reaction scheme involving surface-assisted ionization of the charge separation pair is proposed to account for the coupling between the interfacial chemical reaction and the photoacoustic effect. © 2000 American Chemical Society.
Persistent Identifierhttp://hdl.handle.net/10722/70261
ISSN
2001 Impact Factor: 3.379
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorWeng, YXen_HK
dc.contributor.authorXiao, Hen_HK
dc.contributor.authorChan, KCen_HK
dc.contributor.authorChe, CMen_HK
dc.date.accessioned2010-09-06T06:21:13Z-
dc.date.available2010-09-06T06:21:13Z-
dc.date.issued2000en_HK
dc.identifier.citationJournal Of Physical Chemistry B, 2000, v. 104 n. 32, p. 7713-7724en_HK
dc.identifier.issn1089-5647en_HK
dc.identifier.urihttp://hdl.handle.net/10722/70261-
dc.description.abstractTransient absorption signal delayed by a magnitude of 100 μs with respect to the exciting laser shot is observed after UV laser flash photolysis of degassed benzene, acetone, and acetonitrile solutions of an interface probe complex, i.e., gold(I) complex [{Au[P(C 6H 4OMe-p) 3]} 2-(μ-C≡C)] (μ-ethynylene-bis{tris(4-methoxyphenyl)-phosphine}gold]). Chemical reactions leading to the transient absorbance change are confirmed to be occurring at the solid-liquid interface, and the delay time is believed to arise from the photogenerated intermediate species in the bulk solution crossing the diffusion layer, which ultimately undergo interfacial reactions resulting in the observed transient absorbance change. The delay time is suggested as a direct measure for the thickness of the diffusion layer. The thickness of the diffusion layer around 0.2 μm, estimated by this method, is comparable to that from the sonovoltammetric study. Oscillations in transient absorbance kinetics are also observed, which can be attributed to the coupling between the interfacial chemical reactions and a photoacoustic effect; oscillation due to a single physical process arising from the schlieren effect under certain condition is also discussed. Similar transient phenomena are observed in another luminescent complex, i.e., a hexanuclear Cu(I) cluster Cu 6(t-NS) 6 (t-NS = 4-tert-butylpyridine-2-thiolate). The characterization of the photochemical reaction processes of the Cu(I) complex by means of transient absorbance difference spectra reveals that a consecutive biphotonic ionization process occurs after the laser flash. The intermediate species with a lifetime of 65 μs responsible for the interfacial reaction is tentatively assigned as a charge separation pair. A reaction scheme involving surface-assisted ionization of the charge separation pair is proposed to account for the coupling between the interfacial chemical reaction and the photoacoustic effect. © 2000 American Chemical Society.en_HK
dc.languageengen_HK
dc.publisherAmerican Chemical Society. The Journal's web site is located at http://www.pubs.acs.org/jpcben_HK
dc.relation.ispartofJournal of Physical Chemistry Ben_HK
dc.titleDirect observation of mass transfer at solid-liquid interface by laser flash photolysis of the interface probe moleculesen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1520-6106&volume=104&issue=32&spage=7713&epage=7724&date=2000&atitle=Direct+observation+of+mass+transfer+at+solid-liquid+interface+by+laser+flash+photolysis+of+the+interface+probe+moleculesen_HK
dc.identifier.emailChe, CM:cmche@hku.hken_HK
dc.identifier.authorityChe, CM=rp00670en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/jp001071n-
dc.identifier.scopuseid_2-s2.0-0037788916en_HK
dc.identifier.hkuros64754en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0037788916&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume104en_HK
dc.identifier.issue32en_HK
dc.identifier.spage7713en_HK
dc.identifier.epage7724en_HK
dc.identifier.isiWOS:000088828900022-
dc.identifier.scopusauthoridWeng, YX=7103321459en_HK
dc.identifier.scopusauthoridXiao, H=36893832200en_HK
dc.identifier.scopusauthoridChan, KC=13609968400en_HK
dc.identifier.scopusauthoridChe, CM=7102442791en_HK

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