CL-35 NQR IN SOLID TRICHLOROACETYL HALIDES

By Cl-35 NQR the temperature dependences of the resonance frequencies and spin-lattice relaxation times for the Cl-35 nuclei have been studi ed in solid CCl(3)COHal (Hal=F, Cl, Br, I). A linear correlation betwe en the average Cl-35 NQR frequencies of the CCl3 groups and the electr onegativities of the halogen atoms in the COHal groups has been discov ered. The temperature-dependent NQR data reveal thermoactivated reorie ntations of the CCl(3)COHal molecules as a whole in the crystal lattic e. The activation energies of this motion are found to lie in the rang e 31-37 kJ mol(-1).