抄録
We measured the static magnetic susceptibility and the electron spin resonance of the Fe(Pc)(CN)2 complexes, and investigated the molecular magnetism of the unit Fe(Pc)(CN)2. The magnetic susceptibility shows a highly anisotropic Curie behavior. Based on the electron spin resonance, we found a highly anisotropic g-value (g1=3.62, g2=1.11, and g3=0.52) in the molecular unit Fe(Pc)(CN)2. This anisotropy is caused by the molecular orbital angular momentum in the degenerate next highest occupied molecular orbitals of the molecular unit Fe(Pc)(CN)2. Since the molecular unit Fe(Pc)(CN)2 has a unique structure with fourfold symmetry, the molecular orbital angular momentum has a finite value of lz∼+1 and −1. The anisotropic molecular magnetism of the unit Fe(Pc)(CN)2 contributes the highly anisotropic Curie behavior. The molecular unit Fe(Pc)(CN)2 is a good candidate for a molecular magnet having high magnetic anisotropy.
