Optical rotatory dispersion of AgGaS2

Anderson, W. J.; Yu, P. W.; Park, Y.S.

doi:10.1016/0030-4018(74)90244-2

Cited by 24 publications

(16 citation statements)

References 8 publications

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“…Birefringence values are in agreement with those reported by Hobden (1968), although the slope dÁn/dT of the present data is smaller than that deduced from other works (Bhar et al, 1983). Regarding the optical rotation, our data do not seem to be fully consistent with previous measurements (Hobden, 1968;Anderson et al, 1974) unless an especially large dispersion in the visible takes place. This point will be analysed in the next section.…”

Section: à4supporting

confidence: 69%

“…As far as we know, AgGaS 2 is the inorganic material with the highest optical activity ever reported in the visible range. In subsequent measurements by Anderson et al (1974), values as high as & = 1000 mm À1 were found at 485 nm at a temperature of 5 K. Therefore, it seems of interest to analyse the structural features that are responsible for this special behaviour.…”

Section: Introductionmentioning

confidence: 97%

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Origin of the optical activity of silver thiogallate

Etxebarría¹,

Folcia²,

Ortega³

2000

J Appl Cryst

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Using a high-accuracy universal polarimeter, the birefringence and optical activity of AgGaS 2 have been determined between 300 and 500 K. The optical rotation has been found to be 94 mm À1 at room temperature for a wavelength of 632.8 nm. This value is unexpectedly small if compared with values close to 1000 mm À1 at 485 nm reported previously. The present optical data are well explained using a point-dipole model for the calculation of the refractive indices and optical activity. The main contributors to the optical rotation are the S atoms. However, these atoms are not at positions especially suitable to promote extremely large gyrations. Consequently, the size of the optical rotation reported before in the blue part of the spectrum is presumably due to the existence of a circular dichroism band close to that region. Using an optical system based on a photoelastic modulator, a strong linear dichroism peak has been measured in the range 450±500 nm. This fact has prevented reliable measurement of the circular dichroism.

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Section: à4supporting

confidence: 69%

Section: Introductionmentioning

confidence: 97%

Origin of the optical activity of silver thiogallate

Etxebarría¹,

Folcia²,

Ortega³

2000

J Appl Cryst

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“…Around E 0 , however, the birefringence is small and optical activity takes effect which results in oscillatory behavior of the polarized transmission spectrum [5,6].…”

mentioning

confidence: 99%

“…The large birefringence of some chalcopyrite compounds is a result of their crystal anisotropy that leads to different refractive indices for light polarized parallel (extraordinary light) and perpendicular (ordinary light) to the optical axis [1,5,6]. Here we denote the birefringence as Dn ¼ n e À n o where n e and n o are the refractive indices for extraordinary and ordinary light, respectively.…”

mentioning

confidence: 99%

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Pressure Dependence of the Birefringence in AgGaS2

Nakanishi

Yamamoto

Matsuhashi

et al. 2001

phys. stat. sol. (b)

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Die optische Aktivität achiraler Substanzen

et al. 2008

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Ausgerichtete achirale Molekule und Kristalle mit D2d‐Symmetrie oder einer der nichtenantiomorphen Untergruppen S4, C2v oder Cs können beim Durchstrahlen in einer beliebigen Richtung eine Drehung der Schwingungsebene von linear polarisiertem Licht bewirken. Dies ist in der Kristalloptik eine unangefochtene Tatsache, der Unterricht für Studenten der organischen Chemie vermittelt hingegen eine widersprüchliche Ansicht. Der vorliegende Kurzaufsatz verschafft einen Überblick über Messungen und Rechnungen zu den chiroptischen Eigenschaften einiger achiraler Substanzen und Kristalle. Prototypisch für Verbindungen, die nach van't Hoff optisch inaktiv sein sollten, sind Methanderivate mit vier identischen Liganden, die durch Spiegelebenen in Beziehung stehen. Die Untersuchung der optischen Aktivität einfacher achiraler Verbindungen wie H2O und NH3 vermittelt weitreichende chiroptische Gesetzmäßigkeiten, die oft im Zusammenhang mit chiralen Stoffen übersehen werden. Hier wird anhand gruppentheoretischen Überlegungen, des Transformationsverhaltens von Tensoren und intuitiver Skizzen gezeigt, warum einige achirale azentrische Verbindungen optisch aktiv sind, andere hingegen nicht.

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Optical rotatory dispersion of AgGaS2

Cited by 24 publications

References 8 publications

Origin of the optical activity of silver thiogallate

Origin of the optical activity of silver thiogallate

Pressure Dependence of the Birefringence in AgGaS2

Die optische Aktivität achiraler Substanzen

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