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Thermodynamic stability and structure of nitrogen hydrate crystal

✍ Scribed by Keisuke Sugahara; Yuuki Tanaka; Takeshi Sugahara; Kazunari Ohgaki

Publisher
Elsevier Science
Year
2002
Tongue
English
Weight
161 KB
Volume
2
Category
Article
ISSN
1472-7862

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✦ Synopsis

Stability boundary for the nitrogen hydrate system is investigated in a temperature range from 285 to 310 K and pressure range up to 440 MPa. The present experimental results show that nitrogen hydrates form structure-II without any solid-solid phase transition in the present experimental conditions. The strong pressure dependence of intermolecular O-O vibration reveals that hydrate cage is shrunk by pressurization.

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## Abstract The single‐crystal X‐ray data of akuammigine picrate hydrate (**1**β‹…Picrβ‹…H~2~O) confirm the relative configuration of the indole alkaloid akuammigine (**1**) as __epiallo__ (__Fig.β€…1__). With reference to the known (15__S__)‐configuration due to biosynthesis, the absolute configuration