BR-79,BR-81 NQR SPECTRA OF ALKYL(4-BROMOPHENYL)SULPHIDES

The Br-79, Br-81 NQR spectra of compounds of the series 4-BrC6H4SR wit h R=(CH2)nH (n=1, 2, 4-9), (CH2)nCH(CH3)2 (n = 0-2) and CHm(CH3)3-m we re obtained at 77 K. The halogen atom electron densities in these comp ounds and chlorine-containing analogs are compared. The ratio of the a mplitudes of the NQR frequency oscillations in chlorine- and bromine-c ontaining compounds with R = (CH2)nH corresponds to the ratio of the p olarizabilities of Cl-35 and Br-79. The variation of the alkyl groups R influences the electron distribution of the halogen atom.