Dc magnetic susceptibility (χ) and magnetisation (M) measurements were performed on a powdered microcrystalline sample of 1 in the T = 300-2 K, B = 0.1 T and T = 2-6 K, B = 0.5-7.0 T ranges, respectively. These data are shown in Figure (and Figure ) in the form of the χT product versus T and M vs B. The χT product at T = 300 K is 8.6 cm 3 K mol -1 , similar to the Curie constant expected for seven uncorrelated S = 1 ions with g = 2.2 (8.5 cm 3 K mol -1 ). As temperature decreases the χT product slowly increases to a maximum value of 12.0 cm 3 K mol -1 at T = 20 K, before decreasing at lower temperatures to a value of 10.5 cm 3 K mol -1 at T = 2.0 K. The magnetisation data initially increase rapidly with increasing magnetic field (M = 7 µB at B = 1 T and T = 2 K) T and then rise more gradually thereafter to a maximum value of M = 11 µB at B = 7 T and T = 2 K. The susceptibility and magnetisation data are therefore indicative of the presence of both ferro-and antiferromagnetic exchange interactions. The susceptibility data can be simulated nicely (Figure ) with an isotropic spin-Hamiltonian 𝐻𝐻 � = -2 ∑ 𝐽𝐽 𝑖𝑖𝑖𝑖 𝑠𝑠 ⃗ � 𝑖𝑖 𝑖𝑖<𝑖𝑖