Akademik Veri Yönetim Sistemi
Applied Radiation and Isotopes, cilt.234, 2026 (SCI-Expanded, Scopus)
Gamma-irradiation-induced paramagnetic centers in chloramine-T trihydrate single crystals were investigated by X-band electron paramagnetic resonance (EPR) spectroscopy. Single crystals irradiated with γ-rays at room temperature produced a stable radical that could be detected at 300 K. The EPR spectra exhibit well-resolved hyperfine structures arising from interactions between the unpaired electron and several proton groups. Angular-dependent EPR measurements performed by rotating the crystal about the crystallographic axes revealed pronounced anisotropy, confirming the single-crystal nature of the paramagnetic center. Spectral simulations showed good agreement with the experimental spectra and enabled determination of the principal values of the g- and hyperfine tensors. The magnitude and pattern of the hyperfine interactions, together with near-free-electron g values, indicate that the radiation-induced defect corresponds to a carbon-centered radical formed via C–H bond cleavage. Comparison with previously reported solution-phase EPR studies suggests that the rigid crystalline environment and hydrogen-bonding network of the trihydrate structure play an important role in stabilizing the radical at room temperature.