|Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2004: ¥1,500,000 (Direct Cost: ¥1,500,000)
Fiscal Year 2003: ¥2,000,000 (Direct Cost: ¥2,000,000)
The development of organic ferromagnet and superconductor has attracted much attention in the field of material science, and many studies have been performed with great success in recent years. On the other hand, the examples of magnetic superconductors, where the superconducting state and antiferromagnetic or ferromagnetic order coexist in a system are very limited, because of the difficulty in molecular design of the complexes. Especially, the examples of the magnetic superconductor consisting of purely organic compounds have not been reported.
In the present work, in order to obtain the organic magnetic conductors, first, we prepared several kinds of iodide salts of verdazyl radical cations (for example, 3-(4- and 3-methylpyridinium)-1,5-diphenylverdazyl radical cations ([p-MePyDV]^+ and [m-MePyDV]^+). These iodide salts were reacted with Li^+[TCNQ]^-, Li^+[Me_2-TCNQ]^-, and [n-Bu_4N]^+[Ni(dmit)_2]^- salts, giving the (1:1) salts of verdazyl cations with TCNQ, Me_2-TCNQ, and Ni(dmit)_2 anions. Several kinds of (1:2) and (1:3) salts of verdazyl cations with TCNQ, Me_2-TCNQ, and Ni(dmit)_2 anions were prepared by the oxidation of the (1:1) salts. Further, the magnetic and electric properties, and crystal structures of these radical salts have been studied. It has been clarified that the eight kinds of salts are new molecular magnetic semiconductors.