, Volume 111, Issue 3-4, pp 247-256

Carbon Monoxide: Spectroscopic Characterization of the High–Pressure Polymerized Phase

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Solid carbon monoxide transforms to the δ–phase at about 48 kbar at room temperature. In this pressure regime (50 kbar and greater), carbon monoxide undergoes a transformation at room temperature to a light–pink solid, which has not been studied in detail and may be different from the δ–phase. Exposure to moderate light intensities at these P–T conditions converts the system to a dark red material. We report visible and infrared absorption as well as Raman investigations of this dark red substance, which likely contains a polymeric product of the photochemical reaction. This material is stable upon pressure release down to ambient conditions. Previous studies speculated that the dark red product was a mixture of poly–carbonsuboxide (C3O2) and oxalic anhydride (C2O3). In contrast, we present evidence that this material is composed of graphitic–like carbon, carbon dioxide, and possibly a polymerized network containing \(- \left( {{\text{C = O}}} \right) - {\text{O}} - \left( {{\text{C}} - } \right) = {\text{C}} < \) as a repeating unit.