RADIATION STABILITY OF CIS-ISOMERS OF DICYCLOHEXANO-18-CROWN-6

The gamma-ray initiated decomposition of the pure cis-syn-cis and cis- anti-cis stereoisomers of dicyclohexano-18-crown-6 (DCH-6) and its str ontium nitrate complex was studied by Fourier-transform infrared spect rophotometry and gas-chromatography-mass-spectrometry with integrated doses up to 1.5 MGy and dose rate varying from 3 to 8 Gy/s. The propos ed scheme of radiolysis of DCH-6 that is derived from the experimental data is consistent with symmetric initial cleavage of the C-O bonds b etween the terminal C of the bridging diethylether groups and the O of the cydohexane-1,2-diol groups. The cis-syn-cis isomer of DCH-6 is mo re stable to gamma-radiation than the cis-anti-cis isomer. Copyright ( C) 1996 Elsevier Science Ltd