The effect of high pressure on the vibrational modes of 5-azacytosine (C 3 H 4 N 4 O) and propanedinitrile (CH 2 (CN) 2 ) was investigated at room temperature using a diamond anvil cell (DAC). In situ infrared and Raman spectroscopy results indicated that the ring structure of 5-azacytosine remained preserved and the band shifts induced by high pressure were fully reversible up to 13GPa. For the open-chain structure of propanedinitrile, a polymerization reaction was observed by infrared spectroscopy almost instantly at about 15GPa at room temperature. The same pressure-induced polymerization was observed after a week at 1GPa, at room temperature.
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