Matches in SemOpenAlex for { <https://semopenalex.org/work/W2007195419> ?p ?o ?g. }
Showing items 1 to 75 of
75
with 100 items per page.
- W2007195419 endingPage "437" @default.
- W2007195419 startingPage "427" @default.
- W2007195419 abstract "Abstract The luminescence properties of solutions of caffeine and theophylline in methanol are observed. The effects of the solvent pH, the presence of a heavy atom and the matrix or substrate on the fluorescence and phosphorescence properties of the compounds are evaluated. Caffeine and theophylline fluorescence can be observed at room temperature from dilute methanolic solutions and strong phosphorescence is observed at low temperature when the matrix is in a polycrystalline state. Acidic and basic media cause spectral changes and reduce the intensity of the low temperature phosphorescence. Iodide is a good heavy-atom enhancer of both the low temperature and room temperature phosphorescence of caffeine and theophylline. The intensity of the phosphorescence at room temperature and when spotted on filter paper depends on the type of filter paper and the pH of the spotting solution and/or the pH of the wet surface at the moment of spotting. Theophylline is more sensitive than caffeine to the microenvironment. Under the appropriate experimental conditions, both low temperature and room temperature phosphorescence could be used as analytical tools for the determination of caffeine and theophylline." @default.
- W2007195419 created "2016-06-24" @default.
- W2007195419 creator A5037241082 @default.
- W2007195419 creator A5040799022 @default.
- W2007195419 creator A5049847369 @default.
- W2007195419 date "1987-01-01" @default.
- W2007195419 modified "2023-10-10" @default.
- W2007195419 title "Luminescence characteristics of caffeine and theophylline" @default.
- W2007195419 cites W1971830697 @default.
- W2007195419 cites W1985429048 @default.
- W2007195419 cites W2004987160 @default.
- W2007195419 cites W2007193245 @default.
- W2007195419 cites W2023658151 @default.
- W2007195419 cites W2028609528 @default.
- W2007195419 cites W2033982763 @default.
- W2007195419 cites W2041251388 @default.
- W2007195419 cites W2052158752 @default.
- W2007195419 cites W2056549949 @default.
- W2007195419 cites W2057518163 @default.
- W2007195419 cites W2066322386 @default.
- W2007195419 cites W2080040010 @default.
- W2007195419 cites W2082752388 @default.
- W2007195419 cites W2083097074 @default.
- W2007195419 cites W2521932484 @default.
- W2007195419 doi "https://doi.org/10.1016/0584-8539(87)80129-0" @default.
- W2007195419 hasPublicationYear "1987" @default.
- W2007195419 type Work @default.
- W2007195419 sameAs 2007195419 @default.
- W2007195419 citedByCount "17" @default.
- W2007195419 countsByYear W20071954192022 @default.
- W2007195419 crossrefType "journal-article" @default.
- W2007195419 hasAuthorship W2007195419A5037241082 @default.
- W2007195419 hasAuthorship W2007195419A5040799022 @default.
- W2007195419 hasAuthorship W2007195419A5049847369 @default.
- W2007195419 hasConcept C126322002 @default.
- W2007195419 hasConcept C148869448 @default.
- W2007195419 hasConcept C185592680 @default.
- W2007195419 hasConcept C192562407 @default.
- W2007195419 hasConcept C2778095195 @default.
- W2007195419 hasConcept C2778500429 @default.
- W2007195419 hasConcept C2911072751 @default.
- W2007195419 hasConcept C49040817 @default.
- W2007195419 hasConcept C71924100 @default.
- W2007195419 hasConcept C98274493 @default.
- W2007195419 hasConceptScore W2007195419C126322002 @default.
- W2007195419 hasConceptScore W2007195419C148869448 @default.
- W2007195419 hasConceptScore W2007195419C185592680 @default.
- W2007195419 hasConceptScore W2007195419C192562407 @default.
- W2007195419 hasConceptScore W2007195419C2778095195 @default.
- W2007195419 hasConceptScore W2007195419C2778500429 @default.
- W2007195419 hasConceptScore W2007195419C2911072751 @default.
- W2007195419 hasConceptScore W2007195419C49040817 @default.
- W2007195419 hasConceptScore W2007195419C71924100 @default.
- W2007195419 hasConceptScore W2007195419C98274493 @default.
- W2007195419 hasIssue "3" @default.
- W2007195419 hasLocation W20071954191 @default.
- W2007195419 hasOpenAccess W2007195419 @default.
- W2007195419 hasPrimaryLocation W20071954191 @default.
- W2007195419 hasRelatedWork W15924996 @default.
- W2007195419 hasRelatedWork W1982061077 @default.
- W2007195419 hasRelatedWork W1986317553 @default.
- W2007195419 hasRelatedWork W1994143503 @default.
- W2007195419 hasRelatedWork W2416661590 @default.
- W2007195419 hasRelatedWork W2589647313 @default.
- W2007195419 hasRelatedWork W2788223052 @default.
- W2007195419 hasRelatedWork W3031158172 @default.
- W2007195419 hasRelatedWork W4322764522 @default.
- W2007195419 hasRelatedWork W85055323 @default.
- W2007195419 hasVolume "43" @default.
- W2007195419 isParatext "false" @default.
- W2007195419 isRetracted "false" @default.
- W2007195419 magId "2007195419" @default.
- W2007195419 workType "article" @default.