The optical activity and absolute optical chirality of NaNH4SO4.2H2O

Arzt, Stephanie; Glazer, A. M.

doi:10.1107/s0108768193014569

Cited by 12 publications

(9 citation statements)

References 8 publications

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“…The Hooft y parameter (Hooft et al, 2008), as calculated with PLATON, is 0.07 (2). Interestingly, the structure exhibits chirality opposite to the previously reported room temperature structures (Corazza et al, 1967;Arzt & Glazer, 1994).…”

Section: Figurecontrasting

confidence: 88%

“…The interstices between the [Na(-SO 4 )(-H 2 O) 2 ] n À chains accommodate the ammonium cations, which form hydrogen bonds to sulfate oxygen atoms, thus establishing a three-dimensional network. The positions of the ammonium hydrogen atoms determined in the current study appear to be more accurate than those in the room-temperature structure reported by Arzt & Glazer (1994). Note that details of hydrogen bonding were not discussed in the latter report; based on the reported structure data (Arzt & Glazer, 1994), N-H distances range between 0.73 and 0.99 Å .…”

Section: Data Reportssupporting

confidence: 50%

“…The positions of the ammonium hydrogen atoms determined in the current study appear to be more accurate than those in the room-temperature structure reported by Arzt & Glazer (1994). Note that details of hydrogen bonding were not discussed in the latter report; based on the reported structure data (Arzt & Glazer, 1994), N-H distances range between 0.73 and 0.99 Å . Corazza et al (1967) did not refine hydrogen- Table 1 Selected geometric parameters (Å , ).…”

Section: Data Reportssupporting

confidence: 50%

“…Arzt & Glazer (1994) redetermined the crystal structure at room temperature based on serial detector data. Properties of the well-known ferroelectric SASD have been widely studied (Arzt & Glazer, 1994;Fawcett et al, 1975;Genin & O'Reilly, 1969;Hilczer et al, 1991Hilczer et al, , 1992Hilczer et al, , 1993Kanesaka & Ozaki, 1994;Kassem & Hedewy, 1988;Kloprogge et al, 2006;Lipinski et al, 2003;Lipinski & Kuriata, 2005;Ono et al, 1993;Osaka, 1978;Osaka & Makita, 1970;Ribeiro et al, 2006). Kloprogge et al (2006) also reported a Rietveld refinement of the structure of SASD at room temperature, thereby confirming the results of the previous single-crystal X-ray analyses.…”

Section: Structure Descriptionmentioning

confidence: 99%

“…The title compound, sodium ammonium sulfate dihydrate (SASD), NaNH 4 SO 4 Á-2H 2 O, a synthetic analogue of the mineral lecontite, is a well known ferroelectric. The crystal structure of the paraelectric phase has been re-refined at 170 K on the basis of single-crystal X-ray data, improving the previous study [Arzt & Glazer (1994). Acta Cryst.…”

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confidence: 99%

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Re-refinement of sodium ammonium sulfate dihydrate at 170 K

Eckhardt¹,

Wagner²,

Imming³

et al. 2020

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The title compound, sodium ammonium sulfate dihydrate (SASD), NaNH4SO4·2H2O, a synthetic analogue of the mineral lecontite, is a well known ferroelectric. The crystal structure of the paraelectric phase has been re-refined at 170 K on the basis of single-crystal X-ray data, improving the previous study [Arzt & Glazer (1994). Acta Cryst. B50, 425–431] in terms of accuracy regarding hydrogen-atom positions and thus details of the hydrogen bonding. O—H...O and N—H...O hydrogen bonds between the principal building units [Na(OH2)4O2 octahedra, SO4 tetrahedra and ammonium cations] constitute a three-dimensional network structure.

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Section: Figurecontrasting

confidence: 88%

Section: Data Reportssupporting

confidence: 50%

Section: Data Reportssupporting

confidence: 50%

Section: Structure Descriptionmentioning

confidence: 99%

mentioning

confidence: 99%

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Re-refinement of sodium ammonium sulfate dihydrate at 170 K

Eckhardt¹,

Wagner²,

Imming³

et al. 2020

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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 Rotation of Achiral Compounds

et al. 2008

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Oriented achiral molecules and crystals with D(2d) symmetry or one of its non-enantiomorphous subgroups, S(4), C(2v), or C(s), can rotate the plane of transmitted polarized light incident in a general direction. This well-established fact of crystal optics is contrary to the teaching of optical activity to students of organic chemistry. This Minireview gives an overview of the measurement and calculation of the chiroptical properties of some achiral compounds and crystals. Methane derivatives with four identical ligands related by reflection symmetry are quintessential optically inactive compounds according to the logic of van't Hoff. Analysis of the optical activity of simple achiral compounds such as H(2)O and NH(3) provides general aspects of chiroptics that are not readily broached when considering chiral compounds exclusively. We show here, through the use of group theoretical arguments, the transformation properties of tensors, and diagrams, why some achiral, acentric compounds are optically active while others are not.

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The optical activity and absolute optical chirality of NaNH₄SO₄.2H₂O

Cited by 12 publications

References 8 publications

Re-refinement of sodium ammonium sulfate dihydrate at 170 K

Re-refinement of sodium ammonium sulfate dihydrate at 170 K

Die optische Aktivität achiraler Substanzen

Optical Rotation of Achiral Compounds

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