Transition Metal Azolates from Metallocenes. 2. Synthesis, X-ray Structure, and Magnetic Properties of a Three-Dimensional Polymetallic Iron(Ⅱ) Imidazolate Complex, a Low-Temperature Weak Ferromagnet

摘要

The compound exhibits antiferromagnetic coupling along chains of tetrahedrally coordinated iron centers. A canted spin structure leads to weak ferromagnetism at temperatures below a magnetic phase transition temperature of 17 K. Upon cycling the applied magnetic field between +55 000 and -55 000 G at 4.8 K, a hysteresis loop was obtained with a remnant magnetization of 2500 cm~3 G mol~-1 and a coercive field of 200 G.