Knowledge Bank

The microwave spectrum of 1,1, 2,2-tetrafluorocyclopropane was investigated in the region of 26.5 to 40.0 GHz. Assignments of the $\mu c$ type R-branch transitions were made for the monodeuterated isotopic species and two lowest excited vibrational states of the dideuterated isotopic species, as well as the carbon-13 isotopic species: $\mathrm{<mrow\; data-mjx-texclass="ORD">13</mrow>}CF2CF2CH2,CF2CF2CH2,CF2CF213CD2,$ Transition frequencies were determined in R-band for the following previously assigned species: $CH2CF2CH2,CF2CF2CD2,13CF2CF213CD2,$ The data enable the calculation of a complete molecular structure in the $d0$ and $d2$ isotopic species framework. The structural parameters calculated in the $d0$ frame are: $r(C1C2)=1.471(3)\backslash AAr(C1C3)=1.497(10)\backslash AAr(C1F)=1.344(4)\backslash AAr(C3H)=1.088(5)\backslash AA\Theta (FC1F)=109.9(4)\circ \Theta (HC3H)=118.0(4)\circ$ The structure obtained will be discussed in the context of experimental and theoretical studies of similar systems.