Chem. 54, 3876 (1976). Core-level binding energies of all atoms are reported for the bromo(methy1)-silanes and -germanes Me,MBr4-, (M = Si, Ge; n = 0 + 3) and the iodo(methy1)-silanes and -germanes MenMT4-, (n = 2, 3). Measured binding energy shifts correlate well with values predicted from atomic charge calcuIations using an electronegativity-equilisation procedure. JOHN E. DRAKE, CHRIS RIDDLE, H. ERNEST HENDERSON et BORIS GLAVIN~EVSKI. Can. J. Chem. 54, 3876 (1976).On rapporte des Cnergies de liaisons au niveau du noyau pour tous les atomes des bromornCthyl silanes et germanes Me,MBr4-, (M = Si, Ge; n = 0 + 3) et des iodomkthyl silanes et germanes Me,(M14-, (n = 2, 3). I1 y a une bonne corrklation entre les diplacements mesurCs pour les Cnergies de liaisons et les valeurs que l'on peut prCdire 2 partir des calculs de charge atomique en faisant appel a une procedure d'egalisation des Clectronegativites.[Traduit par le journal]In Part I (1) we reported core-level binding energies for two series of compounds, Me,M-C4-, and Me3MX (n = 0 + 4, M = Si or Ge, X = F, C1, Br, I). Binding energies for each atom in every compound were correlated with the partial charges on those atoms. The charges were calculated using the electronegativity-equalisation method of Huheey (2) which, in turn, is based on the Hinze-Jaffk method (3-5). We introduced the concept of allowing for s-orbital participation in the bonding orbital of the halogen atom, designating the method EESOP (electronegativity-equalisation with s-orbital participation).Because excellent correlations were obtained for the Me,MCl4-, series, we have used the related plots (Fig. 1) as established reference bases for the series Me,MX4-, (X = Br, I) reported in this paper. Thus, the partial charges on carbon 6c, germanium, aGe, silicon, as,, bromine, bBr, and iodine, 61, are calculated by our EESOP method. Then the previously established correlations (Fig. 1) are used to read off a predicted binding energy for each of the EESOP-calculated partial charges. Therefore, all of the halogenoseries MenMX4-,, M = Si, Ge; X = C1, Br, I, are assumed to obey the same linear relationship between partial charge and binding energy. These calculated binding energies are tabulated together with the experimental binding energies in Tables 1 and 2. As we found previously, by allowing for 'The experimental binding energies of C Is and I 3dj/? are corrected relative to Ar 2pi/2 = 248.63 eV (1 I), uncertainty 10.05 eV; those of Ge 3d and Br 3d5,'r are reported relative to Ne 2s a t 48.47 e V (I 1 j, uncertainty 10.05 eV. tPartial charges, 6, calculated by EESOP (1) assuming that germanium is using sp3 hybrid orbitals, xo, = 8.07 + 6.82aG,; that the carbon atom is treated as an 'unbonded tetrahedral carbon atom' using xc = 7.98 + 13.276c; and that there is 16% and 19% s-character on bromine and iodine respectively, using X B~ = 9.98 + 9.1 laBr and x , = 9.54 + 8.296,.$Binding energies are calculated by reference to the plots of BE(expt.) us. 6 for the chloro(methyl)germanes assuming that...