A Diamagnetic Dititanium(III) Paddlewheel Complex with No Direct Metal−Metal Bond

Reaction of Ti[N(But)Ar]3 (Ar = 3,5-C6H3Me2 or Ar‘ = C6H5) with
CO2 at −40 °C produces diamagmetic TiIII paddlewheel complexes
with long Ti−Ti separations (>3.4 Å), thus excluding direct Ti−Ti
bonding. 1H NMR spectroscopy shows that the compounds are
diamagnetic in solution in the temperature range of −65 to +70
°C. In the solid state, the diamagnetism was found to persist
between 2 and 300 K. Calculations at the density functional theory
level suggest that the diamagnetism results from antiferromagnetic
coupling by superexchange through the ligand π system.