title: A diamagnetic dititanium(III) paddlewheel complex with no direct metal-metal bond.
abstract: Reaction of Ti[N(But)Ar]3 (Ar = 3,5-C6H3Me2 or Ar' = C6H5) with CO2 at -40 degrees C produces diamagmetic Ti(III) paddlewheel complexes with long Ti-Ti separations (>3.4 Angstrom), 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 degrees 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 pi system.
authors.affiliation: Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139-4307, USA.
authors.forename: Arjun
authors.initials: A
authors.lastname: Mendiratta
authors.forename: Christopher C
authors.initials: CC
authors.lastname: Cummins
authors.forename: F Albert
authors.initials: FA
authors.lastname: Cotton
authors.forename: Sergey A
authors.initials: SA
authors.lastname: Ibragimov
authors.forename: Carlos A
authors.initials: CA
authors.lastname: Murillo
authors.forename: Dino
authors.initials: D
authors.lastname: Villagrán