Browsing by Author "Odebunmi, Ezekiel O."
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Item Hexakis(benzonitrile)ruthenium(II) bis[tetrafluoroborate(1-)]: a precursor to ruthenium organometallic compounds(Springer, 2015-11-14) Owalude, Samson O.; Odebunmi, Ezekiel O.; Eke, Uche B.; Tella, Adedibu C.; Rheingold, Arnold L.; Jackson, Randy; Suib, Steven L.The new compound, [Ru(NCC6H5)6][BF4]2, has been synthesized by reaction of the polymeric species [{RuCl2(COD)}x] (COD = 1,5-cyclooctadiene) with benzonitrile under reflux and characterized by elemental analysis, IR, NMR spectroscopic analyses, and single crystal X-ray diffraction. The Ru(II) atom is coordinated by six N atoms from six benzonitrile ligands in distorted octahedralc oordination geometry. The compound was crystallized in the monoclinic space group P21/c with unit-cell dimensions a = 10.7536(11) A ° , b = 18.6582(18) A °, c = 20.311(2) A ° , b = 91.864(2) , V = 4073.2(7) A ° 3 and final R of 0.0429.Item Kinetics and mechanism of ruthenium(iii)-catalyzed oxidation of glycine by cerium(iv) ions in acidic medium(Bangladesh Chemical Society, 2017-06-29) Owalude, Samson O.; Odebunmi, Ezekiel O.; Tella, Adedibu C.; Bamigboye, Christiana A.; Adebayo, Ayinde; Ogunlaja, Adeniyi S.Kinetics of oxidation of glycine in acidic solution of cerium(IV) ions in presence of ruthenium(III) ions were studied. The reactions were found to be first-order with respect to [glycine], [Ru(III)] and [Ce(IV)]. The rate is proportional to [H+] while the rates was decreased with increasing [Ce(IV)], [HSO4-] and ionic strength of the medium. The observed kinetic data and the spectroscopic evidence lead to the conclusion that HCHO, (NH3+),-COOH, [RuCl2(H2O)4]+ and Ce(SO4)2 were the reactive species of glycine, Ru(III) chloride and cerium(IV) ions, respectively. Based on the kinetic data, the mechanism of the reaction for the catalytic path was proposed. It was found that Ru(III) chloride forms an intermediate complex, which subsequently reacts with the active form of Ce(IV) to yield the product with regeneration of Ru(III). Activation parameters were evaluated and provided further support to the proposed mechanism.Item Syntheses and X-ray crystal structures of two ruthenium(II) complexes derived from acetonitrile and dimethylphenylphosphonite(Elsevier B.V., 2013-04-10) Owalude, Samson O.; Odebunmi, Ezekiel O.; Eke, Uche B.; Rheingold, Arnold L.; Opembe, Naftali; Suib, Steven L.The ruthenium acetonitrile complex [RuCl2(NCCH3)2{P(OCH3)2C6H5}2] (1) and the stable salt [Ru(CH3CN)4{P(OCH3)2C6H5}2][BF4]2 (2) have been prepared from [RuCl2(NCCH3)2(COD)] and the salt [Ru(COD)(CH3CN)4][BF4]2 respectively. The two compounds have been characterized by IR, microanalytical, NMR measurements and single-crystal X-ray diffraction studies. The ruthenium in both compounds has almost ideal octahedral coordination geometry. One of the complexes, [RuCl2{P(OCH3)2C6H5}2(NCCH3)2] (1) has shown significant catalytic activity for the transfer hydrogenation of simple ketones while the other, [Ru{P(OCH3)2C6H5}2(NCCH3)4][BF4]2 (2) did not show any catalytic activity for this reaction.Item The Synthesis and Structure of Hexakis(dimethylphenylphosphonite)ruthenium(II) bis[tetraphenylborate(–1)](WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, 2014-02-12) Owalude, Samson O.; Odebunmi, Ezekiel O.; Eke, Uche B.; Tella, Adedibu C.; Rheingold, Arnold L.; Suib, Steven L.Treatment of the hydrazine salt [Ru(COD)(H2NNH2)4][BPh4]2 with excess of P(OMe)2Ph in acetone gave a homoleptic complex trans-[Ru{P(OMe)2Ph}6][BPh4]2, which was characterized by IR, 31P{1H}, 13C{1H}, and 1H NMR spectroscopy, elemental analysis, and X-ray crystallography. The ruthenium in the complex has distorted octahedral coordination arrangement and bonded to all the six P(OMe)2Ph molecules through the phosphorus atoms.Item Synthesis and X-ray studies of ruthenium(II) complexes containing hydrazine and benzyl isocyanide ligands(Chemical Society of Ethiopia, 2013-07-24) Owalude, Samson O.; Odebunmi, Ezekiel O.; Eke, Uche B.; Meijboom, Reinout; Nesterov, Vladimir N.; Singleton, Eric; Coville, Neil J.The reaction of the polymeric species [{RuCl2(COD)}x] (1 ; x > 2; COD = cyclo-octa-1,5-diene) and hydrazine hydrate in methanol under reflux gave a pale pink solution from which the salt [Ru(COD)(N2H4)4][BPh4]2.CH3OH (2) was isolated on addition of NaBPh4. Treatment of 2 in refluxing acetone in the presence of the ligand benzyl isocyanide give a complex of stoichiometry [Ru(NH2N=CMe2)2(PhCH2NC)4][BPh4]2 (3) on the substitution of the labile COD ligand. The two compounds have been characterized by elemental analyses, IR and NMR measurements and single-crystal X-ray diffraction studies. The ruthenium in both compounds has a distorted octahedral coordination geometry.Item Synthesis of new ruthenium(II) complexes derived from labile nitrile ligands: an alternative route to the preparation of transdichlorotetrakis(diphenylphosphine)ruthenium(II)(Taylor and Francis, UK., 2017-03-19) Owalude, Samson O.; Tella, Adedibu C.; Odebunmi, Ezekiel O.; Eke, Uche B.; Golen, James E.; Rheingold, Arnold L.; Mahlaka, Thabo Joel; Meijboom, ReinoutNew ruthenium(II) complexes containing labile nitrile ligands have been prepared by treatment of either the polymer [{RuCl2(COD)}x] (COD = cycloocta-1,5-diene) (1) or its derivative [RuCl2(COD)(NCCH3)2]·NCCH3 (2) with the appropriate nitrile ligands in refluxing acetonitrile under argon. A new route to synthesis of trans-dichlorotetrakis(diphenylphosphine)ruthenium(II) (7) was also reported. A redetermination of the structure of 7 was undertaken and X-ray crystallographic data revealed that the complex crystallizes in the triclinic space group P-1 with unit cell dimensions a = 12.7016(9) Å, b = 13.0847(10) Å, c = 14.1498(10) Å, α = 101.46(3)°, V = 2080.6(3) Å3, Z = 2 and R = 0.0309. Its polymorph 7′ was also obtained. The crystal structure of 4 was also determined. This complex crystallizes in the monoclinic space group C2/c with unit cell dimensions a = 27.0510(3) Å, b = 11.0984(13) Å, c = 13.0450(16) Å, α = 90°, V = 3886.5(8) Å3, Z = 8 and R = 0.0282.