Analysis of nmr lineshapes of rigid-lattice multispin systems. III. Bond length and 19F chemical shielding in SF 6, SeF 6, and TeF 6

Abstract

Low-temperature 19F NMR lineshapes were recorded for the clathrate deuteriohydrates of SF6, SeF 6 and TeF 6, the formation of a TeF6 clathrate being reported for the first time. Analysis of the rigid-lattice lineshapes of these six-spin systems gave the following bond distances (±0.01 Å) and 19F chemical shielding anisotropies: 1.58 Å, 310±30 ppm for SF 6; 1.68 Å, 370±20 ppm for SeF 6; 1.84 Å 215±25 ppm for TeF 6. The corresponding spin-rotation tensors were calculated by the method of Flygare.