Chemical bonding and molecular dynamics in inclusion compounds of fluorinated graphite according to F-19 NMR spectroscopy data

In inclusion compounds of fluorinated graphite with chlorine trifluoride C2 F . xClF(3) and hexafluorobenzene C2F . xC(6)F(6), the guest molecules are characterized by rotational mobility and weak bonds with the host matrix. F -19 NMR chemical shift tensors are determined for the fluorine nuclei of th e matrix and the guest molecules, including the structurally nonequivalent fluorine atoms of ClF3 molecules [delta(parallel to) (F1) = -700, delta(per pendicular to)(F1) = -280; delta(parallel to)(F2) = -440, delta(perpendicul ar to)(F2) = -220 ppm relative to F2]. It is shown that C-F bonds in the ho st matrix are close to those in aromatic fluorocarbons.