title: Stabilization of NH tautomers of quinolines by osmium and ruthenium.
abstract: Complexes OsH2Cl2(PiPr3)2 and RuH2Cl2(PiPr3)2 promote the tautomerization of quinoline and 8-methylquinoline to NH tautomers, which lie about 44 kcal.mol-1 above the usual CH tautomers. The NH tautomers are stabilized by coordination to the metal center and by means of a Cl...HN interaction. As a consequence, the six-coordinate elongated dihydrogen complexes OsCl2{kappa-C2-(HNC9H5R)}(eta2-H2)(PiPr3)2, the five-coordinate derivatives RuCl2{kappa-C2-(HNC9H5R)}(PiPr3)2, and the six-coordinate dihydrogen compounds RuCl2{kappa-C2-(HNC9H5R)}(eta2-H2)(PiPr3)2 (R = H, Me) have been isolated and characterized.
authors.affiliation: Departamento de Química Inorganica, Instituto de Ciencia de Materiales de Aragón, Universidad de Zaragoza-CSIC, 50009 Zaragoza, Spain.
authors.forename: Miguel A
authors.initials: MA
authors.lastname: Esteruelas
authors.forename: Francisco J
authors.initials: FJ
authors.lastname: Fernandez-Alvarez
authors.forename: Enrique
authors.initials: E
authors.lastname: Oñate
mesh_terms: D009942:Organometallic Compounds / Q000737:chemistry*; D009992:Osmium / Q000737:chemistry*; D011804:Quinolines / Q000737:chemistry*; D012428:Ruthenium / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D009942:Organometallic Compounds; D011804:Quinolines; D009992:Osmium; D012428:Ruthenium