IR-spectroscopic determination of influence of the thermodynamic conditions on the structural features of liquid CF4

The data on the ‘coordination number’ n and on the nearest-neighbor distance Rnn in liquid CF4 within a broad range of experimental conditions were obtained by the analysis of the profiles of (ν1+ν3) and of (ν3+ν4) IR-absorption bands. The pronounced linear increase on density of n was observed whereas value of Rnn=4.40(5) Å was practically invariable. We consider that the variation of vacancies number is mainly responsible for the change of the density of the liquid on the alteration of its thermodynamic conditions, and it is not due to a simple dilation or contraction of the medium.