The changes observed in the i.r. spectrum of DURING a study of the kinetics and equilibria in the reactions CO,(CO), between -165 and f 2 1 0 "C can be inter-of cobalt carbonyls a t high temperatures and pressures1 preted in terms of variation of the relative concentrations we obtained i.r. spectra of Co,(CO),in the carbonyl stretching of the three isomers of this compound, if the band a t region a t temperatures up to 210 "C under 120 atm CO 2031 cm-1 is reassigned to the third isomer; a weak new pressure.? Earlier work2s3 did not lead to a satisfactory feature in the spectrum a t 2012 cm-l is tentatively explanation of the reversible changes observed in the i.r. assigned to Co(CO),. spectrum of Co,(CO), when heated in solution under CO f The solubility of carbon monoxide is higher in hexane than in liquid paraffin by a factor of 4-4.5 (R. Battino and H. L. Clever,
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