Magnetic and HFEPR Studies of Exchange Coupling in a Series of μ‑Cl Dicobalt Complexes

We report three dinuclear
cobalt­(II) complexes, [Co­(L)­Cl2]2 (L = bpy,
mbpy, and dmpbt), that are bridged solely by chloride ions. High-field
electron paramagnetic resonance and magnetometric measurements were
applied to investigate the magnetic intramolecular Co–Co interactions.
Simulation results based on the multispin model reveal that the complexes
are weakly ferromagnetically coupled and that the isotropic exchange
coupling constants differ slightly for the three complexes. Moreover,
the competing effects of zero-field splitting and magnetic coupling
on the temperature-dependent magnetic susceptibility were analyzed.