title: Neon-Bearing Ammonium Metal Formates: Formation and Behaviour under Pressure.
abstract: The incorporation of noble gas atoms, in particular neon, into the pores of network structures is very challenging due to the weak interactions they experience with the network solid. Using high-pressure single-crystal X-ray diffraction, we demonstrate that neon atoms enter into the extended network of ammonium metal formates, thus forming compounds Nex[NH4][M(HCOO)3]. This phenomenon modifies the compressional and structural behaviours of the ammonium metal formates under pressure. The neon atoms can be clearly localised within the centre of [M(HCOO)3]5cages and the total saturation of this site is achieved after ∼1.5 GPa. We find that by using argon as the pressure-transmitting medium, the inclusion inside [NH4][M(HCOO)3] is inhibited due to the larger size of the argon. This study illustrates the size selectivity of [NH4][M(HCOO)3] compounds between neon and argon insertion under pressure, and the effect of inclusion on the high-pressure behaviour of neon-bearing ammonium metal formates.
authors: Laboratory of Crystallography, University of Bayreuth, 95440, Bayreuth, Germany.
authors: Ines E
authors: http://orcid.org/0000-0002-9851-2615
authors: IE
authors: Collings
authors: Bayerisches Geoinstitut, University of Bayreuth, 95440, Bayreuth, Germany.
authors: Elena
authors: E
authors: Bykova
authors: Bayerisches Geoinstitut, University of Bayreuth, 95440, Bayreuth, Germany.
authors: Maxim
authors: M
authors: Bykov
authors: Bayerisches Geoinstitut, University of Bayreuth, 95440, Bayreuth, Germany.
authors: Sylvain
authors: S
authors: Petitgirard
authors: European Radiation Synchrotron Facility, BP 220, 38043, Grenoble, Cedex 9, France.
authors: Michael
authors: M
authors: Hanfland
authors: European Radiation Synchrotron Facility, BP 220, 38043, Grenoble, Cedex 9, France.
authors: Damian
authors: D
authors: Paliwoda
authors: Bayerisches Geoinstitut, University of Bayreuth, 95440, Bayreuth, Germany.
authors: Leonid
authors: L
authors: Dubrovinsky
authors: Laboratory of Crystallography, University of Bayreuth, 95440, Bayreuth, Germany.
authors: Natalia
authors: N
authors: Dubrovinskaia
keywords: X-ray crystallography; high-pressure chemistry; metal-organic frameworks; neon; noble gases