FRINK Linked Data Fragments server

Matches in SemOpenAlex for { <https://semopenalex.org/work/W1944213281> ?p ?o ?g. }

• W1944213281 endingPage "171" @default.
• W1944213281 startingPage "171" @default.
• W1944213281 abstract "The photoreduction of 9,10-anthraquinone (AQ), the 2-methyl, 2-ethyl, 2,3-dimethyl, 1,4-difluoro, 1-chloro and 1,8-dichloro derivatives as well as 1,4,4a,9a-tetrahydroanthraquinone, 1,2-benzanthraquinone and 6,13-pentacenequinone in nonaqueous solution at room temperature was studied by time-resolved UV-visible spectroscopy. Upon 308 nm excitation of AQ the triplet state reacts with alcohols and triethylamine (TEA). The rate constant of triplet quenching by amines is close to the diffusion-controlled limit. The semiquinone radical *QH/ Q*- is the main intermediate, and the half-life of the second-order decay kinetics depends significantly on the donor and the medium. Photoinduced charge separation after electron transfer from amines to the triplet state of AQ in acetonitrile and the subsequent charge recombination or neutralization also were measured by transient conductivity. The maximum quantum yield, lambdairr = 254 nm, of photoconversion into the strongly fluorescing 9,10-dihydroxyanthracenes is close to unity. The fluorescence with maximum at 460-480 nm and a lifetime of 20-30 ns disappears as a result of a complete recovery into AQ, when the dihydroxyanthracenes are exposed to oxygen. The mechanisms of photoreduction of parent AQ in acetonitrile by 2-propanol and in benzene and acetonitrile by TEA are discussed. The effects of AQ follow essentially the same pattern. The various functions of oxygen, e.g. (1) quenching of the triplet state; (2) quenching of the semiquinone radical, thereby forming HO2*/O2*- radicals; and (3) trapping of the dihydroxyanthracenes are outlined." @default.
• W1944213281 created "2016-06-24" @default.
• W1944213281 creator A5036773492 @default.
• W1944213281 date "2003-01-01" @default.
• W1944213281 modified "2023-10-06" @default.
• W1944213281 title "Photoreduction of 9,10-Anthraquinone Derivatives: Transient Spectroscopy and Effects of Alcohols and Amines on Reactivity in Solution¶" @default.
• W1944213281 cites W1868732237 @default.
• W1944213281 cites W1964403929 @default.
• W1944213281 cites W1965124668 @default.
• W1944213281 cites W1969408680 @default.
• W1944213281 cites W1980345790 @default.
• W1944213281 cites W1985687573 @default.
• W1944213281 cites W1993262635 @default.
• W1944213281 cites W1997119285 @default.
• W1944213281 cites W1997225362 @default.
• W1944213281 cites W1998003529 @default.
• W1944213281 cites W2000344290 @default.
• W1944213281 cites W2001752149 @default.
• W1944213281 cites W2004383613 @default.
• W1944213281 cites W2014877886 @default.
• W1944213281 cites W2015982134 @default.
• W1944213281 cites W2019434602 @default.
• W1944213281 cites W2028509710 @default.
• W1944213281 cites W2030687466 @default.
• W1944213281 cites W2038325590 @default.
• W1944213281 cites W2038825575 @default.
• W1944213281 cites W2043804391 @default.
• W1944213281 cites W2044489285 @default.
• W1944213281 cites W2046707674 @default.
• W1944213281 cites W2058349856 @default.
• W1944213281 cites W2064179008 @default.
• W1944213281 cites W2064639341 @default.
• W1944213281 cites W2066617690 @default.
• W1944213281 cites W2068226906 @default.
• W1944213281 cites W2070898859 @default.
• W1944213281 cites W2070907269 @default.
• W1944213281 cites W2074067031 @default.
• W1944213281 cites W2076238500 @default.
• W1944213281 cites W2086882307 @default.
• W1944213281 cites W2090456031 @default.
• W1944213281 cites W2130516071 @default.
• W1944213281 cites W2132349989 @default.
• W1944213281 cites W2159560949 @default.
• W1944213281 cites W2322647683 @default.
• W1944213281 cites W2949819290 @default.
• W1944213281 cites W2950088179 @default.
• W1944213281 cites W2951575722 @default.
• W1944213281 doi "https://doi.org/10.1562/0031-8655(2003)077<0171:poadts>2.0.co;2" @default.
• W1944213281 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12785056" @default.
• W1944213281 hasPublicationYear "2003" @default.
• W1944213281 type Work @default.
• W1944213281 sameAs 1944213281 @default.
• W1944213281 citedByCount "81" @default.
• W1944213281 countsByYear W19442132812012 @default.
• W1944213281 countsByYear W19442132812013 @default.
• W1944213281 countsByYear W19442132812014 @default.
• W1944213281 countsByYear W19442132812015 @default.
• W1944213281 countsByYear W19442132812017 @default.
• W1944213281 countsByYear W19442132812018 @default.
• W1944213281 countsByYear W19442132812019 @default.
• W1944213281 countsByYear W19442132812020 @default.
• W1944213281 countsByYear W19442132812021 @default.
• W1944213281 countsByYear W19442132812022 @default.
• W1944213281 countsByYear W19442132812023 @default.
• W1944213281 crossrefType "journal-article" @default.
• W1944213281 hasAuthorship W1944213281A5036773492 @default.
• W1944213281 hasConcept C121332964 @default.
• W1944213281 hasConcept C121745418 @default.
• W1944213281 hasConcept C139066938 @default.
• W1944213281 hasConcept C142724271 @default.
• W1944213281 hasConcept C171001562 @default.
• W1944213281 hasConcept C178790620 @default.
• W1944213281 hasConcept C181500209 @default.
• W1944213281 hasConcept C185544564 @default.
• W1944213281 hasConcept C185592680 @default.
• W1944213281 hasConcept C204787440 @default.
• W1944213281 hasConcept C2776370595 @default.
• W1944213281 hasConcept C2776910235 @default.
• W1944213281 hasConcept C2777463227 @default.
• W1944213281 hasConcept C2778913731 @default.
• W1944213281 hasConcept C2780643102 @default.
• W1944213281 hasConcept C32909587 @default.
• W1944213281 hasConcept C62520636 @default.
• W1944213281 hasConcept C71924100 @default.
• W1944213281 hasConcept C75473681 @default.
• W1944213281 hasConcept C76766466 @default.
• W1944213281 hasConcept C91881484 @default.
• W1944213281 hasConceptScore W1944213281C121332964 @default.
• W1944213281 hasConceptScore W1944213281C121745418 @default.
• W1944213281 hasConceptScore W1944213281C139066938 @default.
• W1944213281 hasConceptScore W1944213281C142724271 @default.
• W1944213281 hasConceptScore W1944213281C171001562 @default.
• W1944213281 hasConceptScore W1944213281C178790620 @default.
• W1944213281 hasConceptScore W1944213281C181500209 @default.
• W1944213281 hasConceptScore W1944213281C185544564 @default.
• W1944213281 hasConceptScore W1944213281C185592680 @default.
• W1944213281 hasConceptScore W1944213281C204787440 @default.
• W1944213281 hasConceptScore W1944213281C2776370595 @default.

• next