ESR of gamma irradiated single crystals of cholesteryl acetate and cholesteryl chloroformate

Abstract

Cholesteryl acetate and cholesteryl chloroformate compounds have been irradiated with ⁶⁰Co-γ rays at room temperatures. The irradiated samples have been examined for paramagnetic resonance, and the observed spectra in several cases have been identified with specific radicals. The results in each case have been considered in relation to the present knowledge of the radiation chemistry of the compound. The single crystals have been investigated between 120 and 300 K. The spectra are found to be temperature independent and radiation damage centers are attributed to ĊHCH₂ radical for cholesteryl acetate and ĊH₃ and ĊHCH₂ CH₂ CH₂ radicals for cholesteryl chloroformate.

Keywords:

• ESR
• ĊHCH2
• ĊH3
• ĊHCH2 CH2 CH2
• C29 H48 O2
• Cholesteryl acetate
• C28 H45 ClO2
• Cholesteryl chloroformate
• Spectroscopic splitting factor, g
• Isotropic hyperfine coupling constant, a
• Spin density, ρ