Abstract
High-pressure Raman spectra (300–2200 cm −1) of crystalline Cr(CO) 6 at room temperature for pressures up to 29.5 GPa have been recorded. A probable second-order phase transition is assigned at ∼4.1 GPa. Recorded Raman spectra started to vanish at 20.8 GPa and upon further increase in pressures resulted in complete vanishing at 29.5 GPa. The dν/d p values suggest the breakdown of Dewar–Chatt–Duncanson model for the first time in homoleptic mono carbonyls which has been discussed. Decomposition of Cr(CO) 6 leads to the formation of polymeric CO with characteristic sp 2 carbon and (OCO) units for the first time.
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