INFLUENCE OF POLYETHER RING SIZE AND OF THE NATURE OF SUBSTITUENTS ONTHE YIELDS OF PARAMAGNETIC CENTERS IN GAMMA-IRRADIATED MONOBENZOSUBSTITUTED AND DIBENZOSUBSTITUTED CROWN-ETHERS AT 77 K

Intermediates stabilized in gamma-irradiated mono-and dibenzosubstitut ed crown ethers are studied by ESR spectroscopy at 77 K. PhO. radicals and radicals with H-atom abstraction from polyether ring are the main products at low temperature gamma-radiolysis. The nature of radicals produced in radiolysis and the yield of radicals, G(R), depend on macr oring size and on the number of aromatic substituents. Negative deviat ion from additive rule in function of G(R) versus epsilon of substitue nts is an evidence of efficient transfer of adsorbed energy to the pi- system of aromatic group.