3-Amino-1-methylpyrazin-1-ium iodide

Foucher, Daniel A.; Wylie, Stephen; Macartney, Donal H.; Lough, Alan J.

doi:10.1107/s1600536809051253

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“…For related structures, see Chao et al (1976); Kazheva et al (2006); Foucher et al (1989); Lu & Xi (2008). For the crystal structure of 3-amino-1-methylpyrazin-1-ium iodide, see: Foucher et al (2010). For comparative bond-distance data, see: Allen et al (1987).…”

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3-Amino-1-methylpyrazin-1-ium chloride

et al. 2009

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Section: Related Literaturementioning

confidence: 99%

3-Amino-1-methylpyrazin-1-ium chloride

et al. 2009

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A multi-technique, micrometer- to atomic-scale description of a synthetic analogue of chukanovite, Fe2(CO3)(OH)2

Pignatelli¹,

Mugnaioli²,

Mosser-Ruck³

et al. 2014

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Ordering state in orthopyroxene as determined by precession electron diffraction

Jacob

Palatinus

Cuvillier

et al. 2013

American Mineralogist

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Fe 2+ and Mg distribution on octahedral M1 and M2 sites of the orthopyroxene structure is an indicator of the cooling rate and closure temperature of the mineral. It is generally obtained by single-crystal X-ray diffraction, which is limited in spatial resolution. In this work, we determine the cationic distribution at a submicrometer scale in a transmission electron microscope using precession electron diffraction. Two orthopyroxene samples coming from the same metamorphic rock are studied, a naturally ordered one and a disordered one. The latter was obtained from the ordered sample by annealing at high temperature and rapid quenching. Both samples have been first studied in X-ray diffraction and then in precession electron diffraction. Intensities recorded in zone-axis precession electron diffraction experiments have been quantitatively analyzed and compared to simulations, taking into account dynamical interactions between diffracted beams. Our structure refinement results are in good agreement with those obtained by single-crystal X-ray diffraction. They enable to distinguish between the ordered sample and the disordered one in terms of the observed molar fractions of Fe at M1 and M2 sites. We discuss the sensitivity of the method as a function of experimental parameters. The larger dispersion of the results obtained on the ordered specimen is attributed to structural heterogeneities inherent to the sample.

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3-Amino-1-methylpyrazin-1-ium iodide

Abstract: In the cation of the title compound, C5H8N3 +·I−, the C—N(H2) bond distance [1.338 (8) Å] is at the lower end of the range for aryl amines. In the crystal structure, cations and anions are linked via N—H⋯I hydrogen bonds, forming centrosymmetric four-component clusters.

Cited by 3 publications

References 8 publications

3-Amino-1-methylpyrazin-1-ium chloride

3-Amino-1-methylpyrazin-1-ium chloride

A multi-technique, micrometer- to atomic-scale description of a synthetic analogue of chukanovite, Fe2(CO3)(OH)2

Ordering state in orthopyroxene as determined by precession electron diffraction

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