A Stable and Crystalline Triarylgermyl Radical: Structure and EPR Spectra

摘要

There is much current interest in the chemistry of stable and isolable radicals of the heavier Group 14 elements germanium, tin, and lead. Since the discovery of persistent heavier Group 14 element radicals almost 30 years ago, some germanium- or tin-centered radicals with aryl, alkyl, or amido ligands with half lives varying from minutes to years have been detected and studied by EPR spectroscopy. These compounds were generated either by UV irradiation of solutions containing stable low-valent precursors, hydrogen abstraction from metallanes, or reduction of halide derivatives. Despite the fact that these persistent radicals have been successfully detected in solution, they have successfully defied any attempt of isolation in the solid state for a long time.