Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 8, Issue 11, Pages 2406-2411Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.7b00902
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Funding
- PRIN project ZAPPING [2015HK93L7]
- Italian Ministry of Education, Universities and Research, MIUR
- PICS bilateral project CNR/CNRS (Italy/France)
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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.
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