Tetracyanomethane under Pressure: Extended CN Polymers from Precursors with Built-in sp3 Centers
- Pennsylvania State Univ., University Park, PA (United States)
- Carnegie Inst. of Washington, Washington, DC (United States); Center for High Pressure Science and Technology Advanced Research, Beijing (China)
- Carnegie Inst. of Washington, Washington, DC (United States)
- Naval Research Lab., Washington, D.C. (United States)
Tetracyanomethane, C(CN)4, is a tetrahedral molecule containing a central sp3 carbon that is coordinated by reactive nitrile groups that could potentially transform to an extended CN network with a significant fraction of sp3 carbon. High-purity C(CN)4 was synthesized, and its physiochemical behavior was studied using in situ synchrotron angle-dispersive powder X-ray diffraction (PXRD) and Raman and infrared (IR) spectroscopies in a diamond anvil cell (DAC) up to 21 GPa. The pressure dependence of the fundamental vibrational modes associated with the molecular solid was determined, and some low-frequency Raman modes are reported for the first time. Crystalline molecular C(CN)4 starts to polymerize above ~7 GPa and transforms into an interconnected disordered network, which is recoverable to ambient conditions. Lastly, the results demonstrate feasibility for the pressure-induced polymerization of molecules with premeditated functionality.
- Research Organization:
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)
- Grant/Contract Number:
- AC02-06CH11357; NA0001974
- OSTI ID:
- 1430339
- Journal Information:
- Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory, Vol. 122, Issue 11; ISSN 1089-5639
- Publisher:
- American Chemical SocietyCopyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
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