Paramagnetic resonance of sulfur radicals in synthetic sodalites

McLaughlan, S. D.; Marshall, David J

doi:10.1021/j100701a035

Cited by 66 publications

(44 citation statements)

References 3 publications

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“…Alternatively, it might be proposed that the intrinsic g anisotropy is lower in this host than in the halides. This hypothesis is not consistent with the observation that in other ultramarines for which it was possible to observe a rhombic signal by cooling the sample to 1.4 K the g values (2.005, 2.036, and 2.046) are similar to those in the halides [23].…”

Section: Resultscontrasting

confidence: 84%

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Multifrequency electron paramagnetic resonance of ultramarine blue

et al. 2001

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Electron paramagnetic resonance spectra of the S3 radical center in ultramarine blue over a factor of about 2500 in frequency (258 MHz to 670 GHz) reveal a substantially Lorentzian shape, without resolution of g anisotropy. Variable temperature measurements found that the line width is independent of temperature, within experimental uncertainty, up to about 90 K at 9.5 GHz and between ca. 5 K and room temperature at 95 and 217 GHz, as expected for an exchange-narrowed signal. Analysis of the increase in the low-temperature line width as a function of frequency above 9 GHz is consistent with an exchange interaction of about 2. 10 -2 K. The line width increases as frequency is decreased from 2.7 GHz to 258 MHz which is attributed to the contribution from nonsecular terms that has been denoted the "10/3" effect.

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Section: Resultscontrasting

confidence: 84%

“…2). It has been suggested that the line shape in ultramarine blue was due to motion of the radical [22,23]. Motion of the radical could decrease the effective anisotropy for S3 in ultramarine blue.…”

Section: Resultsmentioning

confidence: 99%

Multifrequency electron paramagnetic resonance of ultramarine blue

et al. 2001

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“…Centre II: g 1 = 2.005, g 2 = 2.005, g 3 = 2.005 À partir des valeurs principales du facteur g, le centre I peut être identifié comme étant dû à l'ion-radical moléculaire S 3 - (Samoilovich et al 1973). Ce centre avec des valeurs très proches de g (Tableau 3), a été observé dans les cristaux de KCl, dans différents amines et dans la sodalite synthétique avec les groupements de soufre (Schneider et al 1966, McLaughlan & Marshall 1970. Différentes études sur la résonance paramagnétique électronique des échantillons synthétiques de lazurite et des autres composés avec les impurités de soufre (Galimov et al 1981) ont montré que les groupements S 3 pouvaient être à l'origine de sa couleur bleue caractéristique.…”

Section: Spectroscopie De Résonance Paramagnétique éLectronique (Rpe)unclassified

Etude Spectrometrique De La Lazurite Du Pamir, Tajikistan

Ostroumov

Fritsch

Faulques

et al. 2002

The Canadian Mineralogist

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SOMMAIRELe spectre de résonance Raman de la lazurite du Pamir, au Tajikistan, a été obtenu pour les excitations de 457.9, 488, 514.5, 676 et 1064 nm. Les bandes Raman ont été attribuées aux groupements S 2 -, S 3 et SO 4 -. Une seule progression du centre S 2 a été obtenue avec l'excitation à 457.9 nm, tandis que deux progressions de centres S 3 ont été observées avec l'excitation 514 nm. Les bandes des groupements SO 4 ont une intensité maximale avec les excitations 676 et 1064 nm. Les spectres ultraviolet-visible (UV-VIS), infrarouge (IR) et de résonance paramagnétique électronique (RPE) confirment la présence de ces centres moléculaires. Mots-clés: lazurite, spectrométrie Raman, ions-radicaux moléculaires de soufre, Pamir, Tajikistan. ABSTRACTThe resonance Raman spectrum of lazurite from the Pamir region of Tajikistan has been obtained by the use of 457.9, 488, 514.5, 676 and 1064 nm excitations. The Raman bands are attributed to S 2 -, S 3 and SO 4 sulfur radicals. The vibrational progression of the S 2 radicals is observed only with the 457.9 nm excitation, whereas two progressions of the S 3 centers take place with the 514 nm excitation. The bands of the SO 4 radicals have maximum intensity with 676 and 1064 nm excitations. Ultraviolet-visible (UV-VIS), infrared (IR) and electron spin resonance (ESR) spectra confirm the presence of these molecular centers.

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“…Während die Frage nach der Natur des Trägers der intensiven Farbe des Lapis lazuli und des künst-lichen Ultramarin-Blaus (UB1) durch ESR- [1][2][3][4][5][6][7][8][9][10][11], VIS- [7,9], IR- [9] und ramanspektroskopische [12][13][14] Untersuchungen mehrerer Arbeitskreisedie sich gegenseitig ergänzten und bestätigten -in überzeugender Weise gelöst worden ist, sind das Ultramarin-Grün (UGr) und das Ultramarin-Rot (URo) noch nicht so eingehend untersucht. Erst in jüngster Zeit sind die Resonanz-Raman-Spektren auch dieser Farbpigmente aufgenommen worden [14].…”

Section: Introductionunclassified

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

Güttler

Wiȩckowski

et al. 1979

Zeitschrift Für Naturforschung B

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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 characteristic band of S3 near 24,400 cm-1.

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Paramagnetic resonance of sulfur radicals in synthetic sodalites

Cited by 66 publications

References 3 publications

Multifrequency electron paramagnetic resonance of ultramarine blue

Multifrequency electron paramagnetic resonance of ultramarine blue

Etude Spectrometrique De La Lazurite Du Pamir, Tajikistan

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

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