A multigram sample of Cr[Bi(SCN) 6 ] • xH 2 O was prepared via solution precipitation, in which an aqueous solution of K 3 Cr(NCS) 6 • 4 H 2 O (5.89 g, 10 mmol) was added to a solution of Bi(NO 3 ) 3 • 5 H 2 O (4.85 g, 10 mmol) in 2M HNO 3 , stirred for 2 hours, filtered, washed with water and dried. . We measured the magnetisation in a 100 Oe applied field using an MPMS-3 magnetometer on warming from a sample cooled in zero field, calculating the susceptibility using the small field approximation.