(N2)6Ne7: A High Pressure van der Waals Inse

Abstract

The binary phase diagram of N(2)-Ne mixtures has been measured at 296 K by visual observation and Raman spectroscopy. The topology of the phase diagram points to the existence of the stoichiometric compound N(2))(6)Ne(7). Its structure has been solved by single-crystal synchrotron x-ray diffraction. The N(2) molecules form a guest lattice that hosts the Ne atoms. This insertion compound can be viewed as a clathrate with the centers of the N(2) molecules forming distorted dodecahedron cages, each enclosing 14 Ne atoms. Remarkably, the N(2))(6)Ne(7) compound is somehow the first clathrate organized by the quadrupolar interaction.

Pressure-induced chemical reactions in the N2(H2)2compound: from the N2and H2species to ammonia and back down into hydrazine

“…Indeed, N 2 -N 2 QQ interactions are known to result in complex structures, as it was found in other van der Waals compounds formed of N 2 and another molecule or element, such as Ne 6 (H 2 ) 7 , (N 2 ) 6 (H 2 ) 7 and the high pressure I4 1 /amd phase of Xe(N 2 ) 2 . 9,23,29 Consequently, understanding the remarkably elaborate structure found in the N 2 (H 2 ) 2 compound requires an in-depth discussion of the energy-minimizing QQ interaction that is outside of this paper's scope.…”

Neon‐Bearing Ammonium Metal Formates: Formation and Behaviour under Pressure

“…Other methods for obtaining neon‐bearing compounds are by 1) formation of a network solid around the neon atoms, and 2) insertion of neon atoms into porous network solids, both of which do not rely on neon interactions with the solid, but rather the space requirements for neon encapsulation. Still, there are only a handful of experimental studies at specific temperature and pressure conditions that report neon encapsulation and insertions, such as in fullerene cages, ice structures, and van der Waals nitrogen networks, and as observed in porous zeolitic and silica networks, respectively …”

Materials by design at high pressures

“…Furthermore, other noble elements also show chemical activity at high pressure, with (N 2 ) 6 Ne 7 being experimentally observed at above 8 GPa. 189 Therefore, future attention might be paid to pressurestabilized Ne, Ar, and Ke compounds.…”