title: Direct synthesis of ligand-based radicals by the addition of bipyridine to chromium(II) compounds.
abstract: The reaction of 2,2'-bipyridine (bpy) with monomeric chromium(II) precursors was used to prepare the S = 1 complexes Cr(tBu-acac)2(bpy) (1) and (η(5)-Cp)(η(1)-Cp)Cr(bpy) (3), as well as the S = 2 compound Cr[N(SiMe3)2]2(bpy) (4). The crystallographically determined bond lengths indicate that the bpy ligands in 1 and 3 are best regarded as radical anions, while 4 shows no structural evidence for electron transfer from Cr(II) to the neutral bpy ligand.
authors: Department of Chemistry, University of British Columbia Okanagan, 3333 University Way, Kelowna, British Columbia, Canada V1V 1V7.
authors: Wen
authors: W
authors: Zhou
authors: Addison N
authors: AN
authors: Desnoyer
authors: James A
authors: JA
authors: Bailey
authors: Brian O
authors: BO
authors: Patrick
authors: Kevin M
authors: KM
authors: Smith
mesh_terms: D017608:Chromium Compounds / Q000737:chemistry*; D018360:Crystallography, X-Ray; D005609:Free Radicals / Q000138:chemical synthesis / Q000737:chemistry; D008024:Ligands; D008958:Models, Molecular; D015394:Molecular Structure; D009942:Organometallic Compounds / Q000138:chemical synthesis / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*
chemical_list: D017608:Chromium Compounds; D005609:Free Radicals; D008024:Ligands; D009942:Organometallic Compounds; D011725:Pyridines; C023666:pyridine