FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W2041284338> ?p ?o ?g. }

• W2041284338 endingPage "1363" @default.
• W2041284338 startingPage "1355" @default.
• W2041284338 abstract "The quenching of Zn(II) tetraphenylporphyrin (ZnTPP) triplets adsorbed onto porous silica or NaA zeolite by molecular oxygen in the gas phase was studied at different temperatures by the diffuse-reflectance laser flash photolysis technique. The quenching is enhanced with decrease in temperature (apparent activation energies are within the range −1.5 to −2.0 kcal/mol) and occurs with high rate constants (2.1 × 105 to 2.4 × 105 Torr-1 s-1). While the ZnTPP delayed fluorescence (DF) is undetectable in evacuated samples, it appears in the presence of O2. The yield of this oxygen-induced DF of ZnTPP corresponds to 10−20% of the prompt fluorescence in a wide range of O2 concentration (partial O2 pressure from 0.001 up to 10 Torr). DF kinetics exhibits a distinct rise part at relatively high O2 pressure. Experimental results are described in terms of a singlet oxygen feedback mechanism which includes the efficient triplet energy transfer from 3ZnTPP to 3O2 and formation of 1O2 followed by a much more efficient energy transfer from 1O2 to the neighbor 3ZnTPP with formation of ZnTPP in the excited singlet state. A homogeneous kinetic treatment predicts some of the unique DF peculiarities (namely the apparent quadratic dependence of DF yield on initial amount of 3ZnTPP, obtained by varying the laser pulse fluence, the growth of DF with a first-order rate constant 2 times greater than that of DF decay at high oxygen concentration, and DF decaying at the same rate as 3ZnTPP at high O2 content or faster at low O2 content) except the lack of variation of DF efficiency with ZnTPP content on the surface, strongly suggesting the existence of a specific arrangement of ZnTPP molecules. The yield of ZnTPP triplets on the surface depends essentially on the oxygen amount in the narrow pressure range from 0.01 to 0.1 Torr which is ascribed to the specificity of ZnTPP adsorption sites on the surface based on oxygen vacancies type defects." @default.
• W2041284338 created "2016-06-24" @default.
• W2041284338 creator A5019624961 @default.
• W2041284338 creator A5037608573 @default.
• W2041284338 creator A5082529008 @default.
• W2041284338 creator A5088710488 @default.
• W2041284338 creator A5090105533 @default.
• W2041284338 date "1997-02-01" @default.
• W2041284338 modified "2023-10-09" @default.
• W2041284338 title "Delayed Fluorescence Induced by Molecular Oxygen Quenching of Zinc Tetraphenylporphyrin Triplets at Gas/Solid Interfaces of Silica and Zeolite" @default.
• W2041284338 cites W1547945059 @default.
• W2041284338 cites W1639950733 @default.
• W2041284338 cites W1963613649 @default.
• W2041284338 cites W1964610270 @default.
• W2041284338 cites W1964971843 @default.
• W2041284338 cites W1966271261 @default.
• W2041284338 cites W1966285171 @default.
• W2041284338 cites W1966682263 @default.
• W2041284338 cites W1971993832 @default.
• W2041284338 cites W1982268762 @default.
• W2041284338 cites W1982757204 @default.
• W2041284338 cites W1983097806 @default.
• W2041284338 cites W1983993295 @default.
• W2041284338 cites W1984465067 @default.
• W2041284338 cites W1986207743 @default.
• W2041284338 cites W1987432154 @default.
• W2041284338 cites W1990039312 @default.
• W2041284338 cites W1994853861 @default.
• W2041284338 cites W1997731500 @default.
• W2041284338 cites W1997960812 @default.
• W2041284338 cites W1998409987 @default.
• W2041284338 cites W2000921279 @default.
• W2041284338 cites W2004056139 @default.
• W2041284338 cites W2007320653 @default.
• W2041284338 cites W2010633972 @default.
• W2041284338 cites W2012805931 @default.
• W2041284338 cites W2013921710 @default.
• W2041284338 cites W2016951804 @default.
• W2041284338 cites W2017027041 @default.
• W2041284338 cites W2017653659 @default.
• W2041284338 cites W2018549848 @default.
• W2041284338 cites W2019121337 @default.
• W2041284338 cites W2019692545 @default.
• W2041284338 cites W2023491051 @default.
• W2041284338 cites W2023890750 @default.
• W2041284338 cites W2026684262 @default.
• W2041284338 cites W2027345989 @default.
• W2041284338 cites W2028307536 @default.
• W2041284338 cites W2028780007 @default.
• W2041284338 cites W2031545465 @default.
• W2041284338 cites W2034162723 @default.
• W2041284338 cites W2036734647 @default.
• W2041284338 cites W2042094435 @default.
• W2041284338 cites W2043633201 @default.
• W2041284338 cites W2044109825 @default.
• W2041284338 cites W2047613988 @default.
• W2041284338 cites W2047751264 @default.
• W2041284338 cites W2048089725 @default.
• W2041284338 cites W2048930776 @default.
• W2041284338 cites W2049089189 @default.
• W2041284338 cites W2053830325 @default.
• W2041284338 cites W2054572177 @default.
• W2041284338 cites W2056492357 @default.
• W2041284338 cites W2062331355 @default.
• W2041284338 cites W2063820460 @default.
• W2041284338 cites W2063958339 @default.
• W2041284338 cites W2067126544 @default.
• W2041284338 cites W2069506896 @default.
• W2041284338 cites W2070278041 @default.
• W2041284338 cites W2070940565 @default.
• W2041284338 cites W2074535052 @default.
• W2041284338 cites W2078891888 @default.
• W2041284338 cites W2081024668 @default.
• W2041284338 cites W2088552693 @default.
• W2041284338 cites W2089263130 @default.
• W2041284338 cites W2089463763 @default.
• W2041284338 cites W2089626372 @default.
• W2041284338 cites W2090493413 @default.
• W2041284338 cites W2090519083 @default.
• W2041284338 cites W2091748601 @default.
• W2041284338 cites W2093957202 @default.
• W2041284338 cites W2103173968 @default.
• W2041284338 cites W2118027078 @default.
• W2041284338 cites W2120680680 @default.
• W2041284338 cites W2121990202 @default.
• W2041284338 cites W2122816594 @default.
• W2041284338 cites W2166533643 @default.
• W2041284338 cites W2332995388 @default.
• W2041284338 cites W2912857047 @default.
• W2041284338 cites W2951592800 @default.
• W2041284338 cites W3005252895 @default.
• W2041284338 cites W31545851 @default.
• W2041284338 doi "https://doi.org/10.1021/jp9624055" @default.
• W2041284338 hasPublicationYear "1997" @default.
• W2041284338 type Work @default.
• W2041284338 sameAs 2041284338 @default.
• W2041284338 citedByCount "29" @default.
• W2041284338 countsByYear W20412843382013 @default.

• next