FeCl 2 (btd-d 4 ) a: A polycrystalline sample of FeCl 2 (btd) (18.82 mg) was immobilised in eicosane (14.73 mg) and sealed in a gelatin capsule. Magnetic susceptibility measurements were performed under field cooled (FC) and zero-field cooled (ZFC) conditions in a 0.01 T and 2 T dc field from 2 K to 300 K. Isothermal magnetisation measurements were performed at 2 K from 0 T to 5 T to -5 T to 5 T.