Continuous Wave EPR of Radicals in Solids

Lund, Anders; Liu, Wei

doi:10.1007/978-94-007-4893-4_1

Cited by 2 publications

(2 citation statements)

References 114 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The hyperfine couplings contain three main contributions corresponding to the hyperfine interaction term (the second term in eq ): (a) the Fermi contact term that arises from the finite electron spin density on the nucleus for s -electrons; (b) the spin dipole–dipole part that arises from the dipole interaction between the magnetic moment of the electron and the magnetic nucleus; (c) the spin–orbit coupling part that is the second order contribution compared to the above two. − The isotropic coupling mainly comes from the Fermi constant, whereas the anisotropic coupling arises from the dipole–dipole interaction, when in the rapid rolling of magnetic particles with a low viscosity liquid, the anisotropic dipole–dipole interaction tends to be averaged, just like the Y 2 @C 79 N molecule in toluene. However, in a rigid ordered system, the dipole–dipole interaction and the spin–orbit coupling strongly depend on the direction of the magnetic field.…”

Section: Results and Discussionmentioning

confidence: 99%

Anisotropic Paramagnetic Properties of Metallofullerene Confined in a Metal–Organic Framework

et al. 2018

View full text Add to dashboard Cite

Paramagnetic metallofullerenes have a spherical molecular structure and stable unpaired spin protected by a fullerene cage and have potential applications in quantum information processing, etc. For endohedral azafullerene Y2@C79N, the N atom on the cage endows the molecule with unpaired spin and is proposed to induce the molecule orientation within the MOF pore via host–guest interaction. Angular-dependent EPR spectroscopy was employed on the Y2@C79N⊂MOF-177 complex to detect the anisotropic paramagnetic properties. These results experimentally confirmed the trend of molecule orientation of Y2@C79N within MOF-177 under certain conditions, which also induces the presence of several conformers of Y2@C79N. The additional EPR splittings in Y2@C79N⊂MOF-177 are proposed to originate from partially disordered molecules as well as the N-coupling of Y2@C79N upon implanting it into the MOF-177 pore. The N-defect on the fullerene cage of Y2@C79N is expected to be utilized as an anchor to build a three-dimensional spin array within MOF matrix.

show abstract

Section: Results and Discussionmentioning

confidence: 99%

Anisotropic Paramagnetic Properties of Metallofullerene Confined in a Metal–Organic Framework

et al. 2018

View full text Add to dashboard Cite

show abstract

“…Attempts were therefore made to simulate the EPR line shape at saturation conditions, taking into account the different saturation properties of allowed (Δm I = 0) and forbidden (Δm I = 1) hyperfine lines in the standard L-alanine EPR dosimeter and other organic materials. Two approaches have been attempted [48,154,155] by adaption of locally used software [50][51][52].…”

Section: Simulation Of Microwave Saturated Epr Spectramentioning

confidence: 99%

Applications of EPR and ENDOR Spectrum Simulations in Radiation Research

Erickson

Lund

2014

Applications of EPR in Radiation Research

Self Cite

View full text Add to dashboard Cite

Applications of EPR and ENDOR simulations of relevance in radiation research involving free radicals, radical pairs, triplet states and to less extent metal complexes are treated. Early fundamental work involving in situ radiolysis of liquids and stickplot analysis of spectra is reviewed, while single crystal analysis is only briefly discussed. The analysis of data obtained with continuous wave methods of species trapped in disordered solids, "powders" is emphasized. Simulations based on first and second order and exact theory are described and exemplified. Methods to obtain parameters for the dynamics of radicals in irradiated solids and for the simulation of spectra at microwave saturation are discussed. Procedures for the simulation of powder ENDOR spectra of radicals are described in detail, with special emphasis on the influence of nuclear quadrupole couplings due to nuclei with I ≥ 1. EPR and ENDOR simulation programs known to us are presented in an Appendix, including addresses for downloading when available.

show abstract

Continuous Wave EPR of Radicals in Solids

Cited by 2 publications

References 114 publications

Anisotropic Paramagnetic Properties of Metallofullerene Confined in a Metal–Organic Framework

Anisotropic Paramagnetic Properties of Metallofullerene Confined in a Metal–Organic Framework

Applications of EPR and ENDOR Spectrum Simulations in Radiation Research

Contact Info

Product

Resources

About