Electron spin resonance spectra of the radicals produced in the radiolysis of aqueous solutions of furan and its derivatives

Abstract

The infrared spectra of YFs and YF2 isolated in argon and nitrogen matrices have been measured in the region 40-800 cm"1. The fundamental frequency assignments in argon assuming Cav symmetry for YFs are ¡^(E) 663 cm"1, f2(AD 119 cm"1, ^(E) 140 cm"1, with v-i unobserved. The frequency assignments for YF2 in nitrogen assuming C2u symmetry are 1/3(61) 538 cm"1, (AD545 cm"1, and i/2(AD 134 cm"1.The results show that YF3 is easily reduced to YF2 in a tantalum Knudsen cell.

Characterization of Free Radicals in Clathrate Hydrates of Furan, 2,3-Dihydrofuran, and 2,5-Dihydrofuran by Muon Spin Spectroscopy

“…The neat liquid sample gave similar results for A µ (see Table 1). Comparison with ESR data [38][39][40][41] and an earlier muon spectroscopic study 23 indicates that the stronger signal (smaller muon hfc) is due to radical 5 and the weaker signal is from 4. This assignment is supported by our DFT calculations, which show that 5 is more stable than 4, as might be expected from the enhanced spin delocalization over the allylic structure.…”

Singlet Oxygen and Superoxide: Experimental Differentiation and Analysis

“…OH' + QcH,oH -H20 + OCHOH (14) We deduce from those experiments that furfuryl alcohol does not react with superoxide or other electron-donating agents potentially present in photosensitized experiments. The reaction of furfuryl alcohol with singlet oxygen yields known products [5] which can be identified and quantitatively analyzed by established chromatographic methods.…”

“…According to earlier investigations on the radiolysis of aliphatic alcohols [ 151, hydrogen abstrac-Tion should take place in the a-position and the resulting allylic radical (Eqn. 14) absorbs at wavelengths >250 nm. The decay of the transient absorption follows second-order kinetics.…”

EPR study of γ-irradiated three-furancarboxylic acid

“…According to the chemical structure of the substance and the available data in refs. [1][2][3][4][5][6], these intensity ratios were attributed to the reaction: We obtained the computer simulations of the spectra which give best agreement with experimental values. These are shown in figure 2, and their EPR parameters are given in table 1.…”

“…Our values for these radicals agreed well with values in refs. [1][2][3][4][5][6]. The variations of A(G) and g-tensors against θ are seen in figure 3.…”