The migration of cations in zeolite CoY was studied by IR spectroscopy. It has been found, that in the presence of water, ammonia, and pyridine cations migrated from hexagonal prisms and/or cubooctahedra to supercages and were able to form complexes with , or pyridine as ligands. The evidence of cations migration was the formation of mononitroslyl or dinitrosyl adducts if NO was sorbed in zeolite with preadsorbed , or pyridine (without preadsorbed molecules hidden in hexagonal prisms and/or cubooctahedra were inaccessible to NO). IR experiments suggested also that not all could migrate. and were able to withdraw only ca. 20-30% of , pyridine was more efficient and has withdrawn ca. 50% of all . ions withdrawn by preadsorbed , or pyridine to supercages can also form carbonyl adducts with CO (without preadsorbed molecules ions were inaccessible to CO). The stretching frequencies of CO (in carbonyl adducts) or NO (in mononitrosyl adducts) for CO and NO interacting with which bonds preadsorbed , or pyridine were distinctly lower than if CO or NO interacted with solo without preadsorbed molecules. This was explained by the transfer of electrons from electrondonor , or pyridine molecules via to antibonding * orbitals of CO and NO.