[en] The analysis was made of the relationship between the radioprotective efficiency of substututed benzothiadiazoles and their electronic characteristics. The protective effect of these substances was shown to correlate with their ability to participate in the electron transfer. It was established that the protective effect comes into play via the formation of metal complexes in which benzothiadiazole molecules are ligands. The protective effect increases with increasing energy of complex ligation and diffusion motility of the radioprotector molecules