The structure of 1,2,3,3-tetrafluorocyclopropene, C 3 F 4 , has been determined at 156 K by X-ray crystallography and in the gas phase by a combined analysis of electron-diffraction data, rotation constants derived from the microwave spectrum, and dipolar coupling constants derived from the liquid crystal 19 F NMR spectrum. Structural parameters (distances/pm, angles/deg) for the solid at 156 K and gas phase (distances (r g ), angles (∠ R )), respectively, are the following: r(C 1 . These values are in excellent agreement with those obtained in an ab initio study of the molecular geometry at the electron-correlated MP2/TZ2P level. The dipole moment of C 3 F 4 has been determined from Stark effect measurements to be 1.313(4) D.

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