We have simulated by ab initio constant pressure molecular dynamics the solid-state polymerization of acetylene recently observed experimentally in the pressure range 3.5–14 GPa. We have found a massive polymerization only at much higher pressure (25 GPa). However, we have also found that a triplet exciton self-trapped on a single, cis-bent molecule in crystalline acetylene is a very effective polymerization seed at lower pressure (<9 GPa), much closer to the experimental threshold. Therefore, we propose that the polymerization observed experimentally is possibly catalyzed by a similar seed. We predict that injection of triplet excitons would greatly enhance the polymerization rate. © 1997 The American Physical Society.
Bernasconi, M., Chiarotti, G., Focher, P., Parrinello, M., Tosatti, E. (1997). Solid-State Polymerization of Acetylene under Pressure: Ab Initio Simulation. PHYSICAL REVIEW LETTERS, 78(10), 2008-2011 [10.1103/PhysRevLett.78.2008].
Solid-State Polymerization of Acetylene under Pressure: Ab Initio Simulation
BERNASCONI, MARCO;
1997
Abstract
We have simulated by ab initio constant pressure molecular dynamics the solid-state polymerization of acetylene recently observed experimentally in the pressure range 3.5–14 GPa. We have found a massive polymerization only at much higher pressure (25 GPa). However, we have also found that a triplet exciton self-trapped on a single, cis-bent molecule in crystalline acetylene is a very effective polymerization seed at lower pressure (<9 GPa), much closer to the experimental threshold. Therefore, we propose that the polymerization observed experimentally is possibly catalyzed by a similar seed. We predict that injection of triplet excitons would greatly enhance the polymerization rate. © 1997 The American Physical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.