title: 16-electron elongated dihydrogen complex stabilized by agostic interaction.
abstract: A 16-electron dicationic dihydrogen complex [Ru(eta2-H...H)(PP)2][OTf]2 [4; PP = (C6H5CH2)2PCH2CH2P(CH2C6H5)2] has been prepared and characterized by protonating the precursor hydride complex [Ru(H)(PP)2)][OTf] (2) using HOTf. The hydride and dihydrogen complexes are stabilized via agostic interaction of the ortho C-H fragment of the phenyl ring on the benzyl group. The intact nature of the H-H bond in this derivative was established from the short spin-lattice relaxation time and the observation of a substantial J(H,D) of 22.0 Hz for the HD isotopomer. The H-H bond distance calculated from J(H,D) is 1.05 A, which falls under the category of elongated dihydrogen ligands.
authors.affiliation: Department of Inorganic & Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India.
authors.forename: Saikat
authors.initials: S
authors.lastname: Dutta
authors.forename: Balaji R
authors.initials: BR
authors.lastname: Jagirdar
mesh_terms: D004583:Electrons; D006859:Hydrogen / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy / Q000379:methods / Q000592:standards; D008968:Molecular Conformation; D009942:Organometallic Compounds / Q000138:chemical synthesis* / Q000737:chemistry*; D012015:Reference Standards; D012428:Ruthenium / Q000737:chemistry*; D013237:Stereoisomerism
chemical_list: D009942:Organometallic Compounds; D012428:Ruthenium; D006859:Hydrogen