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491 results on '"Ryabov, Alexander D."'

151. Iminoacylation

Author

Wagner, Gabriele, primary, Pombeiro, Armando J.L., additional, Kukushkin, Yuri N., additional, Pakhomova, Tatyana B., additional, Ryabov, Alexander D., additional, and Kukushkin, Vadim Yu., additional

Published
1999
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153. Models for the initial stages of oxidative addition. Synthesis, characterization, and mechanistic investigation of eta(super 1)-I2 organometallic 'pincer' complexes of platinum. X-ray crystal structures of (PtI(C6H3(CH2NMe2)(sub 2-)2,6)(eta(super 1)-I2)) and exo-meso-(Pt(eta(super 1)-I3)(eta(super 1)-I2)(C6H3(CH2N(t-Bu)Me)(sub 2-)2,6))

Author

Gossage, Robert A., Ryabov, Alexander D., Spek, Anthony L., Stufkens, Derk J., Beek, Johannus A.M. van, Eldik, Rudi van, and Koten, Gerard van

Subjects
Oxidation-reduction reaction -- Research, Platinum compounds -- Research, Elimination reactions -- Research, Organometallic compounds -- Research, Chemistry
Abstract

Some elementary aspects of the mechanism of the oxidative addition of halogens to d(super 8) organometallic complexes were investigated. Results revealed (PtI(C6H3(CH2NMe2)(sub 2-)2,6)(eta(super 1)-I2)) to be the first crystallographically characterized organometallic eta(super 1)-I2 complex. Thus, it is a model for an initial stage of oxidative addition of X2 molecules to a transition metal. Mechanistic and spectroscopic data show that the complex is formed through a 1,2-shift of the dihalide from the primary product (Pt(eta(super 1)-I3)(C6H3(CH2NMe2)(sub 2-)2,6)).

Published
1999

157. Models for the Initial Stages of Oxidative Addition. Synthesis, Characterization, and Mechanistic Investigation of η1-I2 Organometallic “Pincer” Complexes of Platinum. X-ray Crystal Structures of [PtI(C6H3{CH2NMe2}2-2,6)(η1-I2)] and exo-meso-[Pt(η1-I3)(η1-I2)(C6H3{CH2N(t-Bu)Me}2-2,6)]

Author

Gossage, Robert A., primary, Ryabov, Alexander D., additional, Spek, Anthony L., additional, Stufkens, Derk J., additional, van Beek, Johannus A. M., additional, van Eldik, Rudi, additional, and van Koten, Gerard, additional

Published
1999
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169. Letter

Author

Elding, Lars I., primary, Romeo, Raffaello, additional, Schmülling, Michael, additional, Ryabov, Alexander D., additional, and van Eldik, Rudi, additional

Published
1996
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174. Kinetics and mechanism of halogen-bridge cleavage in dimethylaminomethylphenyl-C 1,N pallada- and platina-cycles by pyridines. pressure effects, and crystal structures of the N,N-cis reaction product, its N,N-trans orthometallated analogue and a dimer of similar reactivity

Author

Ryabov, Alexander D., primary, Kuz'mina, Lyudmila G., additional, Polyakov, Vladimir A., additional, Kazankov, Gregory M., additional, Ryabova, Ekaterina S., additional, Pfeffer, Michel, additional, and van Eldik, Rudi, additional

Published
1995
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181. In situ enzymatic generation of H2O2 from O2 for use in oxidative bleaching and catalysis by TAML activators.

Author

Miller, Jesse A., Alexander, Lisa, Mori, Dylan I., Ryabov, Alexander D., and Collins, Terrence J.

Subjects
HYDROGEN peroxide synthesis, PEROXIDASE, CYTOCHROME P-450, BLEACHING (Chemistry), OXYGEN reduction, GLUCOSE oxidase, HIGH performance liquid chromatography
Abstract

Iron-TAML activators of peroxides are functional mimics of peroxidase and short-circuited cytochrome P450 enzymes that perform numerous transformations that appear by all measures to date to be fully life cycle compatible with the environment. Here we show how to design the same catalytic chemistry without the direct addition of H2O2, thereby removing the need to transport and store hydrogen peroxide. In this new approach, dioxygen is reduced in situ by d-glucose in the presence of glucose oxidase (GO) from Aspergillus niger. The resulting tandem TAML–GO system exhibits similar catalytic efficiency to the TAML/H2O2 prototype. The tandem system is shown here to efficiently decolorize Orange II and oxidize NADH, both near neutral pH (7.5). Computational simulations of the kinetic data suggest that denaturing of GO by oxidized TAML intermediates does not occur throughout each process. This tandem system brings the advantage of in situ generation of low concentrations of H2O2 during the catalytic cycles. This minimizes both unproductive H2O2 consumption resulting from the catalase-like activity of iron TAMLs and suicidal inactivation. Kinetic data for oxidation of NADH by TAML/H2O2 are also reported. [ABSTRACT FROM AUTHOR]

Published
2013
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197. Unusual phenomenon in the chemistry of orthometalated ruthenium (II) complexes

Author

Ryabov, Alexander D., Estevez, Hebert, Alexandrova, Larissa, Pfeffer, Michel, and Lagadec, Ronan Le

Subjects
*RUTHENIUM compounds, *SPECTRUM analysis, *RUTHENIUM, *BIPYRIDINE
Abstract

Abstract: Yellow cyclometalatated ruthenium (II) complexes [Ru(o-X-2-py)(MeCN)4]PF6 (1, X=C6H4 (a) or 4-MeC6H3 (b)) react readily with 1,10-phenanthroline (LL) in MeCN to give brownish-red species cis-[Ru(o-X-2-py)(LL)(MeCN)2]PF6 in high yields. The same reaction of the same complexes under the same conditions with 2,2′-bipyridine results in a significant color change from yellow to brownish-orange suggesting a formation of new species. Surprisingly, X-ray structural studies of these two complexes showed that they are structurally indistinguishable from the starting complexes 1. Referred to as complexes 4a,b, the new compounds are slightly more stable in the air though their spectral characteristics in solution are similar to 1a,b. The diffuse reflectance spectroscopy is so far the only technique that indicated differences between 1 and 4. [Copyright &y& Elsevier]

Published
2006
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