Heavy Atom Ferromagnets under Pressure: Structural Changes and the Magnetic Response

摘要

For decades the idea that molecular radicals might serve as building blocks for organic ferromagnets has fueled research into the structures and properties of light heteroatom radicals such as nitroxyls, verdazyls, and thiazyls. This work yielded a number of systems that order ferromagnetically, but the Curie temperatures T_c of these materials are under 2 K, and their coercive fields H_c are only a few Oersted. More recently, we reported a family of thia/selenazyl radicals 1-4 (Chart 1), the solid state structures and properties of which are strongly dependent upon the nature of the R_1/R_2 ligands and the degree of heavy heteroatom (selenium) incorporation.