Die Uran(IV)-Liganden Wechselwirkungen in den Paramagnetischen Tetra- und (Tris-Cyclopentadienyl) -Halogeniden / Uranium(IV)-ligand Interaction in Paramagnetic Tetra- and (Tris-cyclopentadienyl)-halides

Abstract

The magnetic susceptibilities of the uranium tetrahalides and of the tris-cyclopentadienyluranium- halides were measured from 1 to 300 K by using a Faraday magnetic balance at six applied magnetic fields between 3.50 and 13.1 kOe. It is found that these compounds do not obey a Curie-Weiß law. Their effective magnetic moments at room temperature show maximally 70% of the moment calculated for the free U4+-ion. By taking into account spectroscopic data the experimental magnetic susceptibilities can be described by using a modified Van Vleck theory.