Abstract
High pressure infrared (IR) spectra of tetraiodo- p-benzoquinone (iodanil, C 6O 2I 4) were measured at room temperature to investigate molecularity in the metallic phase appearing above 33 GPa. The spectral profile changes reversibly with pressure below 48 GPa. The highly contrasted IR results between iodanil and bromanil (C 6O 2Br 4) showing irreversible spectral changes with pressure, suggest that iodanil is a novel molecular crystal with a molecular metallic phase in a wide pressure range between 33 and 48 GPa.
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