A chirped pulse Fourier transform microwave study of the refrigerant alternative 2,3,3,3-tetrafluoropropene

►Rotational spectrum of 2,3,3,3-tetrafluoropropene (HFO-1234yf)obtained and analyzed. ► All three singly substituted 13C isotopologues observed in natural abundance. ► Ab initio anharmonic alpha constants provide equilibrium rotational constants. ►Seven atoms are coplanar with a significant barrier to internal rotation.