Two chain compounds of [M(N3)2(HCOO)][(CH3)2NH2] (M = Fe and Co) with a mixed azido/formato bridge displaying metamagnetic behavior.

Two new magnetic chain compounds, where the anionic [M(N3)2(HCOO)-]n chains with a 3-fold bridge of two end-on azido and one syn-syn formato ligands are isolated by the cations of [(CH3)2NH2]+, exhibit metamagnetism because of the strong intrachain ferromagnetic coupling versus the weak interchain antiferromagnetic coupling.