The abundance of Mg in the crust of the earth and its low toxicity have sparked significant interest into investigating the potential of Mg-based reactivity. Expanding from the wellknown organomagnesium chemistry pioneered by Grignard over more than a century ago, Mg complexes have been applied in various ways, such as hydroelementation reactions, Lewis-acid catalysis, polymerisation chemistry, and dehydrocoupling reactions. These complexes are frequently supported by anionic diketiminate (NacNac) ligands that contain hard nitrogen donors to stabilise the Mg-centres. Dimerisation of these complexes is common and found for a variety of bridging ligands such as halides, hydrides, amidoboranes and alkyls. The dimerisation acts as a means to quench the electronic and coordinative unsaturation of the Mg-centres of the respective monomers. The nuclearity of these systems is dependent on various parameters such as: i) the size of the ligand bound to the NacNacMg moiety, ii) the steric strain of the substituents on the backbone and N-donors of the NacNac ligand and iii) the presence of a coordinating solvent/co-ligand. The nuclearity of such systems can be dynamic and also change throughout a catalytic cycle, as has been shown by Garcia et al. who investigated Mg-catalysed hydrosilylation of alkenes. Based on computations they propose that the dinuclear nature of the starting complex is retained upon alkene insertion, after which the subsequent elementary steps proceed through monomeric species. The effect that the nuclearity of Mg-based complexes has on their reactivity can be significant. A prominent example of this was reported by Spielmann et al. They demonstrate that upon using a dinucleating (bis-NacNac) ligand (Scheme 1), the thermal decomposition of amidoborane complexes proceeds cleanly via a single mechanism and at significantly lower temperatures than the mononuclear analogues. It should be noted that despite the enforced proximity of the Mg-centres in these systems resulting in enhanced reactivity, the tethered NacNac moieties still possess a large degree of flexibility, best evidenced through the large variation in Mg-Mg distances observed for the various dinuclear complexes reported. To the best of our knowledge, all dimagnesium complexes supported by dinucleating ligands possess a level of flexibility that allows the Mg-centres to rotate away from each other. Although this flexibility enables dynamic switching between mononuclear and multinuclear pathways, it also makes it difficult to study the intrinsic reactivity of the dimagnesium complexes. Intrigued by the pronounced effect that nuclearity has on the reactivity of magnesium complexes, we set out to investigate a system wherein a dimagnesium core is bound in a constrained and rigid ligand environment. Herein, we describe how a 1,8naphtyridine-based dipp DAMN (Di-Amino-Methylene-Naphthyridine) ligand provides a rigid dinucleating motif that enforces close proximity of the Mg centres and prevents formation of mononuclear Mg complexes. Using a combination of reactivity studies and computations we probe the intrinsic reactivity of the dimagnesium core, rationalise the observed trends and extend them to literature systems.