Due to the relative rarity of the 61 Ni-MS technique, reports on molecular Ni complexes that are dominated by a magnetic interaction are difficult to find which makes it challenging to contextualize the 5.4 T field. However, the existence of this hyperfine magnetic field is already indicative that the NiNx sites in NiPACN have nonzero spin density at the nucleus that couples with the nuclear spin through the. In other words, Ni-SR-MS suggests that the NiNx sites are paramagnetic or, in the case of Ni 2+ , are high spin (S = 1) which leads to spin polarization of core orbitals and results in the Fermi contact interaction. This is in opposition to the commonly accepted square planar geometry of the NiNx sites which are unlikely to have a high spin ground state due to the high-lying 𝑑 𝑥 2 -𝑦 2 orbital. Thus, the existence and origin of paramagnetism in the NiNx sites in 61 NiPACN need to be understood for a more accurate description of the active site.