Abstract :
Summary form only given. The major theories for ferromagnetic interactions in organic solids include orbital degenerecy as the necessary condition. Moreover, the ferromagnetic superexchange between magnetic metal ions through ligand, conventionally requiresthe metal-ligand-metal angle of 90/spl deg/. According to these suggestions metal phthalocyanines MPc (M-transitional metal, Pc=C/sub 32/H/sub 16/N/sub 8/) are very interesting objects for investigations. We report here results of a magnetic study of series of compounds based on MPc (M=Mn,Fe,Ni,Co), doped by alkali metals (Na, K, Rb, Cs), which exhibits a hysteresis loop at room temperature and unusual magnetization dependence from temperature. The samples which were magnetically diluted by diamagnetic freebase phthalocyanine in different proportions (4:1, 2:1, 1:1) before doping, after doping exhibited the ferromagnetism only below 100K. All obtaining compounds are stable up to 60-80/spl deg/C on air and was appeared to be amorphous from X-ray diffraction measurements. The average values of the saturation magnetization changes from 0.4-3.5 emu/g and coercive forces- from 70 to 260 Gs. EPR, X-ray and magnetic dates are discussed.
