Vibrational Intensities. XVI. COF2, COCl2, and COBr2

Abstract

The integrated intensities of all the vibrational fundamentals of COF₂ COCl₂, and COBr₂ have been measured. From these, the values of the dipole‐moment derivatives have been found. A particularly interesting feature of these results is that numerical values of $\mathrm{\partial \mu \hspace{0.17em}/\hspace{0.17em}\partial r}$ for the carbonyl bond can be found without resolving the well‐known sign ambiguity of the $\mathrm{\partial p\hspace{0.17em}/\hspace{0.17em}\partial Q\text{'}}\mathrm{s}$ . We find for COF₂, ${\mathrm{\partial \mu \hspace{0.17em}/\hspace{0.17em}\partial r}}_{\mathrm{CO}}\text{\hspace{0.17em}=\hspace{0.17em}4.70\hspace{0.17em}±\hspace{0.17em}0.7}\mathrm{D}\mathrm{\hspace{0.17em}/\hspace{0.17em}}\mathrm{\AA }$ ; for COCl₂, ${\mathrm{\partial \mu \hspace{0.17em}/\hspace{0.17em}\partial r}}_{\mathrm{CO}}\text{\hspace{0.17em}=\hspace{0.17em}4.75\hspace{0.17em}±\hspace{0.17em}0.2}\mathrm{D}\mathrm{\hspace{0.17em}/\hspace{0.17em}}\mathrm{\AA }$ ; and for COBr₂, ${\mathrm{\partial \mu \hspace{0.17em}/\hspace{0.17em}\partial r}}_{\mathrm{CO}}\text{\hspace{0.17em}=\hspace{0.17em}5.25\hspace{0.17em}±\hspace{0.17em}0.2}\mathrm{D}\mathrm{\hspace{0.17em}/\hspace{0.17em}}\mathrm{\AA }$ .