Radiation stability of cis-isomers of dicyclohexano-18-crown-6

Abstract The γ-ray initiated decomposition of the pure cis-syn-cis and cis-anti-cis stereoisomers of dicyclohexano-18-crown-6 (DCH-6) and its strontium nitrate complex was studied by Fourier-transform infrared spectrophotometry and gas-chromatography-mass-spectrometry with integrated doses up to 1.5 MGy and dose rate varying from 3 to 8 Gy/s. The proposed shceme of radilysis of DCH-6 that is derived from the experimental data is consistent with symmetric initial cleavage of the CO bonds between the terminal C of the bridging diethylether groups and the O of the cyclohexane-1,2-diol groups. The cis-syn-cis isomer of DCH-6 is more stable to γ-radiation than the cis-anti-cis isomer.