Zum Problem der Farbträger des Ultramarin-Grün und des Ultramarin-Rot / On the Problem of the Colored Species in Ultramarine Green and Ultramarine Red

Seel, F.; Güttler, Hans‐Joachim; Wiȩckowski, Andrzej; Wolf, B.

doi:10.1515/znb-1979-1210

Cited by 12 publications

(4 citation statements)

References 13 publications

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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%

Identification of the EPR signal of S2− in green ultramarine pigments

Raulin

Gobeltz²,

Vezin

et al. 2011

Phys. Chem. Chem. Phys.

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Green and blue ultramarine pigments are characterized by the sodalite structure Na(6)(Al(6)Si(6)O(24)) and colored inserted species. These chromophores are sulfur species: S(3)(-) (blue) and S(2)(-) (yellow). Both radicals are encapsulated inside the β-cages. They contribute to the EPR spectrum of ultramarine pigments. The well-known strong EPR signal observed in all ultramarine pigments Continuous-Wave (CW) spectra has long been assigned to S(3)(-) (g = 2.029). In contrast, the S(2)(-) contribution is still subject to controversy because its signal in ultramarine pigments was not resolved even at low temperature in CW-EPR experiments. In this study, we identify unambiguously for the first time by CW-EPR and field sweep-echo detected (FS-ED) EPR the signal of S(2)(-) in ultramarine pigments and we determine its tensor components: g(1) = 2.69(6), g(2) = 2.03(4) and g(3) = 1.86(4).

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Section: Distinction Between the Signals Of The Iron Impurities And Smentioning

confidence: 87%

Identification of the EPR signal of S2− in green ultramarine pigments

Raulin

Gobeltz²,

Vezin

et al. 2011

Phys. Chem. Chem. Phys.

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“…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%

Inorganic sulfur–nitrogen compounds: from gunpowder chemistry to the forefront of biological signaling

et al. 2016

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The reactions between inorganic sulfur and nitrogen-bearing compounds to form S-N containing species have a long history and, besides assuming importance in industrial synthetic processes, are of relevance to microbial metabolism; waste water treatment; aquatic, soil and atmospheric chemistry; and combustion processes. The recent discovery that hydrogen sulfide and nitric oxide exert often similar, sometimes mutually dependent effects in a variety of biological systems, and that the chemical interaction of these two species leads to formation of S-N compounds brought this chemistry to the attention of physiologists, biochemists and physicians. We here provide a perspective about the potential role of S-N compounds in biological signaling and briefly review their chemical properties and bioactivities in the context of the chronology of their discovery. Studies of the biological role of NO revealed why its chemistry is ideally suited for the tasks Nature has chosen for it; realising how the distinctive properties of sulfur can enrich this bioactivity does much to revive 'die Freude am experimentellen Spiel' of the pioneers in this field.

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“…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%

Ultramarine, Lazurite and Sodalite Studied by Positron Annihilation and EPR Methods

et al. 1995

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Studies of positron annihilation accompanied by EPR technique were undertaken for sodalite and lazurite and their synthetic counterparts (synthetic sodalite and ultramarines). Results of measurements performed by two techniques of positron annihilation spectroscopy (angular correlation of annihilation radiation, ACAR, and positron annihilation lifetime) revealed the undoubted influence of free radicałs on positron annihilation mechanism but both inhibition of positronium formation by them and the effect of filling cages ought to be taken into account. The distinct differences between ACAR curves for sodalites, lazurites and ultramarines probably reflect the presence of different radicals in their cages and chemical heterogeneity as well as the disorder in Al, Si-site ordering in case of ultramarines. Comparison of the results of ACAR measurements with the ones of the EPR studies indicates that there is correspondence between them. Similarly to three families of the ACAR curves, different likes of EPR lines were obtained for three groups of samples; sodalites, lazurites and ultramarines. It is possible that the annihilation of positrons takes place mainly with unpaired electrons recorded by the EPR technique.PACS numbers: 61.90.+d, 71.60.+z, 76.30.-v, 78.70.-g (29) 30 A. Baranowski et al.

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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

Cited by 12 publications

References 13 publications

Identification of the EPR signal of S2− in green ultramarine pigments

Identification of the EPR signal of S2− in green ultramarine pigments

Inorganic sulfur–nitrogen compounds: from gunpowder chemistry to the forefront of biological signaling

Ultramarine, Lazurite and Sodalite Studied by Positron Annihilation and EPR Methods

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