A new dithiolene complex magnet: [Ni(Cp*Rubdt(2)][CF3SO3

摘要

The unique salt [Ni(Cp*Rubdt)(2)][CF3SO3], containing the features of both a metal dithiolene complex and a metallocene, has been studied by d.c. and a.c. magnetic susceptibility measurements. This indicated ferromagnetism with T-c = 3.5 K as evidenced by splitting of the field-cooled and zero-field-cooled d.c. susceptibility, remnant magnetisation, a non-zero imaginary component and a peak in the real component of the a.c. susceptibility and magnetic hysteresis. Studies of magnetisation against field indicated superparamagnetic behaviour above the ordering temperature up to around 10-20 K, suggesting correlated behaviour of the spins in one or two dimensions before the onset of 3D order. In contrast to many mixed dithiolene complex-metallocene salts, the structure of the title compound ensures that no segregation of the dithiolene and metallocene components into separate stacks can occur, a structural feature that has previously led to interesting magnetic materials. (C) 2003 Elsevier Science Ltd. All rights reserved. [References: 16]