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231224s2012 xx |||||o 00| ||eng c |
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|a 10.1021/la300053r
|2 doi
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|a pubmed24n0717.xml
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|a (DE-627)NLM215124073
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|a (NLM)22303867
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|a DE-627
|b ger
|c DE-627
|e rakwb
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|a eng
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1 |
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|a Porel, Mintu
|e verfasserin
|4 aut
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|a Photoinduced electron transfer across a molecular wall
|b coumarin dyes as donors and methyl viologen and TiO2 as acceptors
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|c 2012
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|a Text
|b txt
|2 rdacontent
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|a ƒaComputermedien
|b c
|2 rdamedia
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|a ƒa Online-Ressource
|b cr
|2 rdacarrier
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|a Date Completed 30.07.2012
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|a Date Revised 21.11.2013
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|a published: Print-Electronic
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|a Citation Status MEDLINE
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|a Coumarins C-153, C-480, and C-1 formed 1:2 (guest:host) complexes with a water-soluble cavitand having eight carboxylic acid groups (OA) in aqueous borate buffer solution. The complexes were photoexcited in the presence of electron acceptors (methyl viologen, MV(2+), or TiO(2)) to probe the possibility of electron transfer between a donor and an acceptor physically separated by a molecular wall. In solution at basic pH, the dication MV(2+) was associated to the exterior of the complex C-153OA(2), as suggested by diffusion constants (~1.2 × 10(-6) cm(2)/s) determined by DOSY NMR. The fluorescence of C-153@OA(2) was quenched in the presence of increasing amounts of MV(2+) and Stern-Volmer plots of I(o)/I and τ(o)/τ vs [MV(2+)] indicated that the quenching was static. As per FT-IR-ATR spectra, the capsule C-153@OA(2) was bound to TiO(2) nanoparticle films. Selective excitation (λ(exc) = 420) of the above bound complex resulted in fluorescence quenching. When adsorbed on insulating ZrO(2) nanoparticle films, excitation of the complex resulted in a broad fluorescence spectrum centered at 500 nm and consistent with C-153 being within the lipophilic capsule interior. Consistent with the above results, colloidal TiO(2) quenched the emission while colloidal ZrO(2) did not
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|a Journal Article
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|a Research Support, Non-U.S. Gov't
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|a Research Support, U.S. Gov't, Non-P.H.S.
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|a Colloids
|2 NLM
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|a Coloring Agents
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|a Coumarins
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|a titanium dioxide
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|a 15FIX9V2JP
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|a Titanium
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|a D1JT611TNE
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|a Paraquat
|2 NLM
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|a PLG39H7695
|2 NLM
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1 |
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|a Klimczak, Agnieszka
|e verfasserin
|4 aut
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|a Freitag, Marina
|e verfasserin
|4 aut
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|a Galoppini, Elena
|e verfasserin
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|a Ramamurthy, V
|e verfasserin
|4 aut
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|i Enthalten in
|t Langmuir : the ACS journal of surfaces and colloids
|d 1992
|g 28(2012), 7 vom: 21. Feb., Seite 3355-9
|w (DE-627)NLM098181009
|x 1520-5827
|7 nnns
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| 773 |
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|g volume:28
|g year:2012
|g number:7
|g day:21
|g month:02
|g pages:3355-9
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|u http://dx.doi.org/10.1021/la300053r
|3 Volltext
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