Structure and reactivity of 2,4,6-tricyano-1,3,5-triazine under high-pressure conditions
| Autor: | Michael Hanfland, Samuele Fanetti, Roberto Bini, Margherita Citroni, Kamil Dziubek, Marcelo M. Nobrega, Paul F. McMillan, Andrea Sella |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
triazines
synchrotron X-ray diffraction FTIR spectroscopy high pressures Phase boundary Materials science 02 engineering and technology General Chemistry Nitride 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Diamond anvil cell 0104 chemical sciences Crystal Crystallography chemistry.chemical_compound chemistry Phase (matter) X-ray crystallography General Materials Science Orthorhombic crystal system 0210 nano-technology Carbon nitride |
| Zdroj: | CrystEngComm (Camb., Online) 21 (2019): 4493–4500. doi:10.1039/c8ce02154f info:cnr-pdr/source/autori:Fanetti, Samuele; Nobrega, Marcelo M.; Dziubek, Kamil; Citroni, Margherita; Sella, Andrea; McMillan, Paul F.; Hanfland, Michael; Bini, Roberto/titolo:Structure and reactivity of 2,4,6-tricyano-1,3,5-triazine under high-pressure conditions/doi:10.1039%2Fc8ce02154f/rivista:CrystEngComm (Camb., Online)/anno:2019/pagina_da:4493/pagina_a:4500/intervallo_pagine:4493–4500/volume:21 |
| DOI: | 10.1039/c8ce02154f |
| Popis: | 2,4,6-Tricyano-1,3,5-triazine is an attractive precursor for the synthesis of extended layered and nanoporous carbon nitrides. Using high pressure can achieve this via one-step condensation reactions. As a first step towards this goal we have characterized the structural properties and stability P-T range of the monomer (phase I) using synchrotron X-ray diffraction combined with FTIR spectroscopy under combined high pressure and high temperature conditions in a resistively heated diamond anvil cell. A new high pressure structure (phase II) appeared following compression to above 2.4 GPa at ambient temperature. The structure was identified as orthorhombic belonging to space group P2(1)2(1)2(1). The pressure-temperature conditions of the I-II phase boundary, as well as the melting line have been established. The chemical transformation of the phase II crystal was studied between 4 and 10 GPa at temperatures ranging from 550 to 300 K. X-ray and spectroscopic examination of the reaction products revealed a crystalline phase that could be assigned to a layered carbon nitride containing linked s-triazine rings along with amorphous material. Analysis of the kinetics indicates that the structural transformation is driven by defect formation. |
| Databáze: | OpenAIRE |
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