Rose bengal in poly(2-hydroxyethyl methacrylate) thin films: Selfquenching by photoactive energy traps
The effect of dye concentration on the fluorescence, ΦF, and singlet molecular oxygen, ΦΔ, quantum yields of rose bengal loaded poly(2-hydroxyethyl methacrylate) thin films (∼200 nmthick) was investigated, with the aim of understanding the effect of molecular interactions on the photophysical proper...
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IOP Publishing Ltd
2017
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| LEADER | 11178caa a22008297a 4500 | ||
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| 001 | PAPER-17695 | ||
| 003 | AR-BaUEN | ||
| 005 | 20230518204903.0 | ||
| 008 | 190410s2017 xx ||||fo|||| 00| 0 eng|d | ||
| 024 | 7 | |2 scopus |a 2-s2.0-85040462803 | |
| 040 | |a Scopus |b spa |c AR-BaUEN |d AR-BaUEN | ||
| 100 | 1 | |a Ezquerra Riega, S.D. | |
| 245 | 1 | 0 | |a Rose bengal in poly(2-hydroxyethyl methacrylate) thin films: Selfquenching by photoactive energy traps |
| 260 | |b IOP Publishing Ltd |c 2017 | ||
| 270 | 1 | 0 | |m Román, E.S.; CONICET-Universidad de Buenos Aires, Instituto de Química Física de Los Materiales, Medio Ambiente y Energía (INQUIMAE), Ciudad Universitaria, Pab. IIArgentina; email: esr@qi.fcen.uba.ar |
| 506 | |2 openaire |e Política editorial | ||
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| 520 | 3 | |a The effect of dye concentration on the fluorescence, ΦF, and singlet molecular oxygen, ΦΔ, quantum yields of rose bengal loaded poly(2-hydroxyethyl methacrylate) thin films (∼200 nmthick) was investigated, with the aim of understanding the effect of molecular interactions on the photophysical properties of dyes in crowded constrained environments. Films were characterized by absorption and fluorescence spectroscopy, singlet molecular oxygen (1O2) production was quantified using a chemical monitor, and the triplet decay was determined by laser flash-photolysis. For the monomeric dilute dye, ΦF=0.05±0.01 andΦΔ=0.76±0.14. The effect of humidity and the photostability of the dye were also investigated. Spectral changes in absorption and fluorescence in excess of 0.05Mand concentration self-quenching after 0.01Mare interpreted in the context of a quenching radius model. Calculations of energy migration and trapping rates were performed assuming random distribution of the dye. Best fits of fluorescence quantum yields with concentration are obtained in the whole concentration range with a quenching radius rQ=1.5 nm, in the order of molecular dimensions. Agreement is obtained only if dimeric traps are considered photoactive, with an observed fluorescence quantum yield ratio ΦF, trap/ΦF, monomer≈0.35. Fluorescent traps are capable of yielding triplet states and 1O2. Results show that the excited state generation efficiency, calculated as the product between the absorption factor and the fluorescence quantum yield, is maximized at around 0.15 M, a very high concentration for random dye distributions. Relevant information for the design of photoactive dyed coatings is provided. ©2017 IOP Publishing Ltd. |l eng | |
| 536 | |a Detalles de la financiación: PIP 112-201101-00467 | ||
| 536 | |a Detalles de la financiación: Agencia Nacional de Promoción Científica y Tecnológica | ||
| 536 | |a Detalles de la financiación: Universidad de Buenos Aires, UBACyT 20020130100166BA | ||
| 536 | |a Detalles de la financiación: Consejo Nacional de Investigaciones Científicas y Técnicas | ||
| 536 | |a Detalles de la financiación: Agencia Nacional de Promoción Científica y Tecnológica, 2014-2153, PICT 2012-2357 | ||
| 536 | |a Detalles de la financiación: This work has been supported by the Universidad de Buenos Aires (UBACyT 20020130100166BA), the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET PIP 112-201101-00467) and the Agencia Nacional de Promoción Científica y Tecnoló-gica (ANPCyT PICT 2012-2357 and 2014-2153). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript. HBR and ESR are staff members of CONICET. The authors have declared that no conflicting interests exist. | ||
| 593 | |a CONICET-Universidad de Buenos Aires, Instituto de Química Física de Los Materiales, Medio Ambiente y Energía (INQUIMAE), Ciudad Universitaria, Pab. II, Buenos Aires, Argentina | ||
| 593 | |a INIFTA (UNLP-CONICET), Facultad de Ciencias Exactas, Universidad Nacional de la Plata, Diag. 113 y Calle 64, La Plata, Argentina | ||
| 690 | 1 | 0 | |a ENERGY TRAPPING |
| 690 | 1 | 0 | |a FLUORESCENCE |
| 690 | 1 | 0 | |a PHEMA |
| 690 | 1 | 0 | |a POLYMER FILMS |
| 690 | 1 | 0 | |a ROSE BENGAL |
| 690 | 1 | 0 | |a SINGLET MOLECULAR OXYGEN |
| 700 | 1 | |a Rodríguez, H.B. | |
| 700 | 1 | |a Román, E.S. | |
| 773 | 0 | |d IOP Publishing Ltd, 2017 |g v. 5 |k n. 1 |p Methods Appl. Fluoresc. |x 20506120 |t Methods and Applications in Fluorescence | |
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