1979
DOI: 10.1515/znb-1979-1210
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Zum Problem der Farbträger des Ultramarin-Grün und des Ultramarin-Rot / On the Problem of the Colored Species in Ultramarine Green and Ultramarine Red

Abstract: ESR and UV/VIS spectra indicate that the color of ultramarine green is due to two radical ions S2- (yellow) and S3- (blue) whereas ultramarine red contains the neutral sulfur molecule S4 (red) predominantly. On heating in chlorine gas, ultramarine violet was converted to a red powder which exhibited the ESR signal of SO3- with g = 2.0036 and in its reflection spectrum the charac… Show more

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Cited by 12 publications
(4 citation statements)
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“…The industrial green UP has already been studied at room temperature in previous work. 21,22,32 In addition to the well known narrow signal of S 3 À (g = 2.029), a broad EPR signal observed at ca. g = 2.4 was incorrectly assigned to S 2 À .…”
Section: Distinction Between the Signals Of The Iron Impurities And Smentioning
confidence: 87%
“…The industrial green UP has already been studied at room temperature in previous work. 21,22,32 In addition to the well known narrow signal of S 3 À (g = 2.029), a broad EPR signal observed at ca. g = 2.4 was incorrectly assigned to S 2 À .…”
Section: Distinction Between the Signals Of The Iron Impurities And Smentioning
confidence: 87%
“…81 He was particularly interested in theat that timequite mysterious chemistry of the blue trisulfide radical anion (S 3 •− ), 82 which is responsible for the blue color of the gemstone lapis lazuli. 83,84 For a tutorial review about the identification, analysis and chemical properties of S 15 N-NMR shift of 339 ppm) formed in the reaction of nitrite with sulfur or polysulfide was also formed by the reaction of polysulfides with NO gas. 10 The latter made it highly unlikely that the orange/red product could be a perthionitrate (SSNO 2 − ), but suggested it was a perthionitrite (SSNO − ) instead.…”
Section: Perspective Dalton Transactionsmentioning
confidence: 99%
“…The real contents of studied ultramarines coming from Reckitt's Colours Co. were given in [25] A possible excess of oxygen atoms over the number of 24 which form the Si-O-Al framework of the unit cell has to be attributed (a) to a partial oxidation of the sulphidic S (mainly to sulphur dioxide and to sulphate) which increases within the series UGR < UBl < UVI < URo, and (b) to the water content. Ultramarine is hydrophilic and at most 1.6 water molecules can be absorbed in one sodalite cage [25] that cannot be removed by simple drying.…”
mentioning
confidence: 99%
“…Ultramarine is hydrophilic and at most 1.6 water molecules can be absorbed in one sodalite cage [25] that cannot be removed by simple drying.…”
mentioning
confidence: 99%