Abstract – Publication

Synthesis, characterization and reactivity of halides/pseudohalides and their complexes containing ruthenium II in the hydrogenation of cyclohexene.
RIBEIRO, Murillo C.; CORRÊA, Rodrigo S.; BARBOSA, Marília I. F.; DELOLO, Fábio G.; ELLENA, Javier; BOGADO, André L.; BATISTA, Alzir A.
Abstract: In this paper, the influence of pseudohalide ligands coordinated to the ruthenium center on the hydrogenation of cyclohexene was investigated. The pseudohalide complexes containing ruthenium were synthesized from the cis-[RuCl2(dppb)(N-N)] {where N-N = 2,20-bipyridine (bipy) (1A), 4,40-dimethyl- 2,20-bipyridine (Me-bipy) (2), or 4,40-dimethoxy-2,20-bipyridine (MeO-bipy) (3), dppb = 1,4-bis (diphenylphosphino)butane}, by chloride exchange to provide complexes with general formula cis- [RuL2(dppb)(N-N)] {where L2 = N3 (4), (7) and (9) CN (5), (8) and (10) or SCN (6) and (11)}. All complexes were characterized using spectroscopic, electrochemical techniques, as well as elemental analyses to check their molecular formulation and purity. Furthermore, crystal structure of the complexes cis-[Ru (N3)2(dppb)(bipy)] (4), cis-[Ru(CN)2(dppb)(bipy)] (5), cis-[Ru(SCN)2(dppb)(bipy)] (6), cis-[Ru(CN)2(dppb) (Me-bipy)] (8), and cis-[Ru(SCN)2(dppb)(MeO-bipy)] (11) were determined by single-crystal X-ray diffraction, as well as the X-ray structure of the solvate complex [RuCl(CH3CN)(dppb)(bipy)](PF6) (1B). Dichloride and pseudohalide complexes containing ruthenium were applied as pre-catalysts in the hydrogenation of cyclohexene, after pre-established conditions using the cis-[RuCl2(dppb)(bipy)] (1A) as a target complex. The quantitative conversion of cyclohexene to cyclohexane was obtained in 5 h at 25 C using 0.1 mol% of (1A) in methanol solution at 15 atm H2. The substituted bipy derivatives (2) and (3) were also effective pre-catalysts, but pseudohalides were not under these conditions.
Polyhedron
v. 137, p. 311-320 - Ano: 2017
Fator de Impacto: 1,926
http://dx.doi.org/10.1016/j.poly.2017.08.013
    @article={002853410,author = {RIBEIRO, Murillo C.; CORRÊA, Rodrigo S.; BARBOSA, Marília I. F.; DELOLO, Fábio G.; ELLENA, Javier; BOGADO, André L.; BATISTA, Alzir A.},title={Synthesis, characterization and reactivity of halides/pseudohalides and their complexes containing ruthenium II in the hydrogenation of cyclohexene},journal={Polyhedron},note={v. 137, p. 311-320},year={2017}}

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