Magnetic Shielding of 19F in XeF2

The rigid-lattice second moment of the 19F nuclear magnetic resonance of XeF2 has been measured as a function of the external magnetic field. The experimental shielding anisotropy | Δσ | = 105 ± 10 × 10−6 does not agree closely with a value of σ⊥ − σ‖ = − 506 × 10−6 previously calculated using a localized orbital model. The field-independent rigid-lattice second moment is ∼ 0.4 G2 larger than that calculated from crystallographic data, probably because of large amplitude vibrations in XeF2. The temperature dependences of the second moment and of the spin–lattice relaxation time are also reported.