Electron Spin Relaxation of Photoexcited Porphyrin in Water-Glycerol Glass.

ABSTRACT: Recently, the photoexcited triplet state of porphyrin was proposed as a promising spin-label for pulsed dipolar electron paramagnetic resonance (EPR). Herein, we report the factors that determine the electron spin echo dephasing of the photoexcited porphyrin in a water-glycerol matrix. The electron spin relaxation of a water-soluble porphyrin was measured by Q-band EPR, and the temperature dependence and the effect of solvent deuteration on the relaxation times were studied. The phase memory relaxation rate (1/T_m) is noticeably affected by solvent nuclei and is substantially faster in protonated solvents than in deuterated solvents. The T_m is as large as 13-17 μs in deuterated solvent, potentially expanding the range of distances available for measurement by dipole sp

SUBMITTER: Sannikova N 

PROVIDER: S-EPMC7321249 | biostudies-literature | 2020 Jun

REPOSITORIES: biostudies-literature