Intermolecular Interactions in Highly Disordered, Confined Dense N-2

Year: 2017

Authors: Santoro M., Gorelli FA., Bini R., Haines J.

Autors Affiliation: CNR, INO, I-50019 Sesto Fiorentino, Italy; European Lab Non Linear Spect LENS, I-50019 Sesto Fiorentino, Italy;‎ Univ Florence, Dipartimento Chim, I-50019 Sesto Fiorentino, Italy;‎ Univ Montpellier, ENSCM, CNRS, ICGM, F-34090 Montpellier, France

Abstract: Molecular nitrogen is a benchmark system for condensed matter and, in particular, for looking at universal properties of strongly confined dense systems. We conducted Raman and X-ray diffraction measurements on a dense and disordered form of molecular nitrogen subnanoconfined in a noncatalytic pure SiO2 zeolite under pressure, up to 50 GPa. In this form, N-2-N-2 interactions and, consequently, distances are found to be very dose to those of bulk N-2 and intramolecular interactions progressively weaken upon increasing pressure. Surprisingly, the filled zeolite is still crystalline at 50 GPa with silicon in tetrahedral coordination by oxygen, which is a record pressure for this type of coordination among all the known forms of silica. We have thus found a rationale for the polymerization of a number molecules occurring in the microchannels of noncatalytic zeolites under pressure, where the pressure threshold is found to be very similar to that observed in bulk samples.

Journal/Review: THE JOURNAL OF PHYSICAL CHEMISTRY LETTERS

Volume: 8 (11)      Pages from: 2406  to: 2411

KeyWords: HIGH-PRESSURE SYNTHESIS; SOLID NITROGEN; ATOMIC PHASES; 1 MBAR; GPA; SILICALITE; ZEOLITE; ZSM-5; RAMAN
DOI: 10.1021/acs.jpclett.7b00902

Citations: 8
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