title: Syntheses and characterization of organo-group 14 cobaloxime compounds.
abstract: Reactions of cobaloxime Na[(t-BuPy)Co(DH)2] with Ph3ECl (E = Si, Ge, Sn, and Pb) were investigated. Metal-metal bonded complexes (t-BuPy)Co(DH)2EPh3 were isolated for E = Sn and Pb. (t-BuPy)Co(DH)2SnPh3.(C2H5)2O, C39H52CoN5O5Sn, crystallized in the monoclinic space group P21/c (Z = 4) with unit cell dimensions a = 11.6443(6) A, b = 15.6085(8) A, c = 22.6354(12) A, beta = 96.634(1) degrees , and V = 4086.4(4) A3 at 295(2) K. The structure resembled those of six-coordinate alkyl cobaloxime complexes and had Co-NPy and Co-Sn distances of 2.056(2) and 2.5568(3) A, respectively. (t-BuPy)Co(DH)2PbPh3, C35H42CoN5O4Pb, crystallized in the monoclinic space group P21/n (Z = 4) with unit cell dimensions a = 15.0104(7) A, b = 15.7693(8) A, c = 16.6230(8) A, beta = 114.348(1) degrees , and V = 3584.8(3) A3 at 295(2) K. The complex was nearly isostructural with the Sn analogue and had Co-NPy and Co-Pb distances of 2.049(2) and 2.6191(4) A, respectively. Coupling of the ortho phenyl protons to the spin 1/2 isotopes of Sn and of Pb was a characteristic feature of the 1H NMR spectrum. Additional, longer range couplings were observed for the Pb complex and for both complexes in the 13C NMR. Metal-metal bonded complexes were not obtained for E = Si or Ge. The products isolated in the latter case were the hydride Ph3GeH and the cobalt(II) complex (t-BuPy)Co(DH)2,C17H27CoN5O4, which crystallized in the orthorhombic space group Pbcn (Z = 8). Unit cell dimensions were a = 17.9821(11) A, b = 9.7449(6) A, c = 22.7374(15) A, and V = 3984.4(4) A3 at 295(2) K. The five-coordinate complex had Co-NPy = 2.096(2) A and was dimeric in the lattice.
authors.affiliation: Department of Chemistry, West Virginia University, Morgantown, WV 26506, USA. astolzen@wvu.edu
authors.forename: Alan M
authors.initials: AM
authors.lastname: Stolzenberg
authors.forename: Sarah R
authors.initials: SR
authors.lastname: Workman
authors.forename: Jessica E
authors.initials: JE
authors.lastname: Gutshall
authors.forename: Jeffrey L
authors.initials: JL
authors.lastname: Petersen
authors.forename: Novruz
authors.initials: N
authors.lastname: Akhmedov
mesh_terms: D002621:Chemistry / Q000379:methods; D002625:Chemistry, Organic / Q000379:methods*; D003035:Cobalt / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray / Q000379:methods; D019281:Dimerization; D007854:Lead / Q000737:chemistry; D008024:Ligands; D009682:Magnetic Resonance Spectroscopy / Q000379:methods*; D008280:Magnetics; D008956:Models, Chemical; D008958:Models, Molecular; D008968:Molecular Conformation; D010091:Oximes / Q000737:chemistry*; D014001:Tin / Q000737:chemistry
chemical_list: D008024:Ligands; D010091:Oximes; D007854:Lead; D003035:Cobalt; D014001:Tin