Isomeric cheniical shift (IS) of the Mossbauer y-line of Sn1I9 (23.8 keV), SbI2' (37-2 keV), Te12S (35-6 keV) have been studied in the isoelectronic complexes, SnHa1g2, SbHalG' and TeHalZ2 (Hal = F, Cl, Br, I). Some other compounds of antimony have been also measured. The IS-values for these compounds depend linearly on the electro-negativity differences of the Mossbauer atom and ligand. The relation between relative change of the mean-square charge nuclear radius for three y-transitions, (&R/R)sb/(&R/R)s, = -(5.5 f0. 3) and ( & R / R ) T ~/ ( ~R / R ) s ~= + (1-1 f0.2), is obtained by comparing these dependences. In 37.2 keV and 35.6 keV y-transitions, the calibration of the IS value associated with one 5s-electron was also carried out. We have obtained the recoilless fraction of the 37-2 keV y-quanta from Sn12102 source as equal to f = 0*3228:8$. From the measurements of the dependence of resonance effect on the Sb205 absorber thickness the value of the total internal conversion coefficient for the 37-2 keV y-transition is -10.

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