有機強磁性体の分子設計と構築
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概要
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There are two approaches toward the establishment of macroscopic spins for organic molecules. One is the exploration of persistent free radicals (<I>S</I>=1/2) that will have ferromagnetic interradical exchange coupling in crystalline states. While this approach has led to the discovery of well characterized organic ferromagnets, their Curie temperatures (<I>T</I><SUB>c</SUB>) are limited to sub-liquid-helium temperatures. Alternatively, design and synthesis of super-high-spin (<I>S</I>>>1/ 2) organic molecules have been studied. In principle, parallel alignment of two spins can become favored in non-Kekulé systems. One of the highlights of the oligomers and polymers obtained by repeating such units is the synthesis and characterization of a strongly paramagnetic nonacarbene (<I>S</I>=9). The two-dimensional network alignment of spins has been demonstrated to be most promising as high <I>T</I><SUB>c</SUB> molecular ferromagnets. Some non-Kekulé molecules were found by EPR spectroscopy and magnetic susceptibility/magnetization measurements to violate Hunds rule, thereby being disqualified as the units for super-high-spin polymers.
- 社団法人 有機合成化学協会の論文