ENDOR of Organic Radicals in Solution

Abstract

A survey is given over the end or method as applied to organic doublet radicals in solution. After discussing the experimental requirements for successful end or-in-solution work, selected examples are presented which demonstrate the power and limitations of the endor method. The examples chosen cover endor work on protons, ¹⁹F, ¹⁴N, and ¹³C nuclei in radicals dissolved in isotropic and anisotropic solutions. Some emphasis is put on ¹⁴N-ENDOR in liquid crystals because by this technique quadrupole couplings of radicals in solution can be measured directly from the line positions. In an Appendix a complete survey is given of ENDOR-in-solution publications.