3+ shows two irreversible oxidation waves at +1.47 and +1.71 V vs. FcH/FcH + in MeCN (Figure , Figure , Table ). On the reductive side, we found four waves with decreasing reversibility (-0.94, -1.76, -2.02, -2.51 V vs. FcH/FcH + ). We assign the first wave at -0.94 V vs. FcH/FcH + to a metal-centered reduction (Mo III/II ) because it is plausible that the larger Mo III center is easier to reduce than Cr III in mer-[Cr(ddpd)2] 3+ (-1.11 V vs. FcH/FcH + ). Table : Electrochemical data of cisfac- [3] To probe the properties of the electronic ground state of cisfac-[3] 3+ , we first performed SQUID magnetometry on a pressed pellet of the complex from 1.8 to 300 K (Figure ). The experimental temperature-susceptibility value (T) is 1.67 cm 3 K mol -1 at room temperature and yields a g-value of 1.89 based on the Curie law for a S = 3 /2 spin system. A g-value below 2 is expected for less than half-filled d-shells. Additionally, the drop of T below 50 K hints towards substantial ZFS or an intermolecular exchange pathway in cisfac- [3] 3+ . The experimental data are reproduced well by spin Hamiltonian simulations using Eq. 1, with the Bohr magneton µB, the spin operators Ŝ, Ŝx, Ŝy, and Ŝz, the g-tensor g, the magnetic field vector B, and the axial and transversal ZFS parameters D and E (Table ). H = 𝜇 𝐵 𝑺 ̂⋅ 𝒈 ⋅ 𝑩 + 𝐷𝑆 ̂𝑧 2 + 𝐸(𝑆 ̂𝑥 2 -𝑆 ̂𝑦 2 )