Study of solvation of excess electrons in ethylene glycol/water and methyltetrahydrofuran matrices by matrix ENDOR

Matrix proton ENDOR signals have been measured for stabilized excess electrons produced by x irradiation at 4 K in ethylene glycol/water and in 2−methyltetrahydrofuran glasses. The matrix proton ENDOR linewidths are smaller when irradiation is carried out at 77 K. The contribution to the matrix ENDOR linewidth comes principally from predominantly dipolar interactions between the unpaired electron and the surrounding matrix protons. The change in ENDOR linewidth can be interpreted as due to a slight increase in the average distance from the trapped electron to the matrix protons contributing to the matrix ENDOR line as the temperature is raised to 77 K. This is a reflection of the solvation process for the excess electron in these organic glasses. Based on a simple model, the CH bond and molecular dipoles reorient such that the negative H end of the average CH dipole moves 0.2−0.4 A further away from the unpaired electron as solvation becomes more complete at higher temperature. These results are consisten...

[1]  M. Bowman,et al.  Matrix proton ENDOR studies of the overlap of trapped electron wavefunctions with first solvation shell molecules in methanol glass at 77 K , 1974 .

[2]  R. Schwartz,et al.  Matrix endor linewidths of trapped silver atoms and aromatic nitroxide radicals in polycrystalline and glassy matrices at 77°K: correlation with matrix polarity , 1973 .

[3]  L. Kevan,et al.  ENDOR of trapped hydrogen atoms in gamma‐irradiated glassy acid matrices and in polycrystalline oxyanion matrices , 1973 .

[4]  M. Ogasawara,et al.  Electronic spectra of trapped electrons in organic glasses at 4°K. 3-methylpentane, 3-methylhexane and methylcyclohexane , 1972 .

[5]  A. Namiki,et al.  Trapped Electrons Produced in Ethanol Glass at 4°K , 1972 .

[6]  L. Kevan,et al.  Matrix ENDOR Linewidths of Trapped Electrons in Glassy Matrices at 77°K , 1972 .

[7]  H. Yoshida,et al.  Electron Spin Resonance Study of Trapped Electron in 2-Methyltetrahydrofuran Irradiated at 4°K , 1972 .

[8]  L. Kevan.  Pulse Radiolysis of Alcohol Glasses at 77°K: Mechanism of Electron Trapping , 1972 .

[9]  George G. Teather,et al.  SPECTRAL SHIFTS OF TRAPPED ELECTRONS IN ALKANE GLASSES AT 76$sup 0$K. , 1972 .

[10]  L. Kevan,et al.  Application of the Semicontinuum Model to the Effect of Dipole Reorientation on Trapped Electron Spectra in Glassy Ethanol , 1972 .

[11]  A. Namiki,et al.  ELECTRONIC SPECTRA OF TRAPPED ELECTRONS IN ORGANIC GLASSES AT 4$sup 0$K. III. EFFECT OF AN ELECTRON SCAVENGER IN ETHANOL. , 1972 .

[12]  L. Kevan.  Pulse radiolysis study of the mechanism of electron trapping in alcohol glasses at 77°K , 1971 .

[13]  J. K. Thomas,et al.  Photoionization of molecules in low temperature glasses , 1971 .

[14]  H. Hase,et al.  Electronic Spectra of Trapped Electrons in Organic Glasses at 4°K , 1971 .

[15]  H. Hase,et al.  Electronic Spectra of Trapped Electrons in Organic Glasses at 4°K. II. Ethanol‐Methanol Mixtures , 1971 .

[16]  N. Klassen,et al.  Absorption Spectrum of Trapped Electrons in 3‐Methylhexane Glass at 77°K , 1971 .

[17]  H. Yoshida,et al.  Electron Traps in Irradiated Water–Ethylene Glycol Glass at 4 and 77°K , 1970 .

[18]  J. K. Thomas,et al.  TRAPPING OF ELECTRONS IN LOW-TEMPERATURE GLASSES. A PULSE RADIOLYSIS STUDY. , 1970 .

[19]  H. Yoshida,et al.  ELECTRON SPIN RESONANCE STUDY OF TRAPPED ELECTRONS IN IRRADIATED ORGANIC GLASSES AT 4.2$sup 0$K. , 1970 .

[20]  J. S. Hyde,et al.  Endor [electron-nuclear double resonance] of methyl, matrix, and .alpha. protons in amorphous and polycrystalline matrixes , 1968 .

[21]  D. Smith,et al.  Detection of trapped electrons in organic glasses after gamma irradiation at 4.2 °K by electron spin resonance spectroscopy , 1967 .