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From the high-resolution  19 F NMR spectrum of single crystal sym-C 6 Cl 3 F 3  its chemical shift shielding tensor is determined. The most shielded direction lies perpendicular to the molecular plane and the least shielded one in the molecular plane perpendicular to the C-F bond. The most (σ 33 ) and least (σ 11 ) shielded components change significantly in going from sym-C 6 H 3 F 3  and sym-C 6 Cl 3 F 3  to C 6 F 6  whereas the component in the C-F bond direction (σ 22 ) changes little. It is concluded that the π-electron density distribution varies little but the σ-electron density is changed when other substituents are introduced. At 20 °C the sym-C 6 Cl 3 F 3  molecule rotates about its figure axis and its motion averages out the shielding tensor components within the molecular plane. The mode of the molecular motion does not change at the phase transition point (296 K) and up to the melting point in the time scale of  l9 F high-resolution spectra.

19 F High-Resolution Nuclear Magnetic Resonance Study of Structure and Properties of Crystalline sym-C 6 Cl 3 F 3