[en] The vibration and electronic vibration spectra of Di-uranyl sufate have been studied. Analysis of the shifts of the structural group vibration frequencies due to their interaction with crystal lattice, has made it possible to determine the spectral regions exhibiting normal vibrations of sulfate ions that differ in spatial structure and in the type of coordination with uranyl ion. The O-O line splitting at low temperature electronic vibrational spectra could be used as a basic for the interpretation of these spectra using a multicenter model. These mechanisms are of interest for further development of the theory of complex compounds. The changes observed in the structure of tetrahedral sulfate ions upon variations in chemical compositions of a substance could be used for studying the processes of lattice reorganization and elucidation of the nature of phase transitions in ferroelectric crystals containing such a group. (author)