Добірка наукової літератури з теми "Uranium imido complexes"

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Статті в журналах з теми "Uranium imido complexes"

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Maria, Leonor, Nuno A. G. Bandeira, Joaquim Marçalo, Isabel C. Santos, and John K. Gibson. "CO2 conversion to phenyl isocyanates by uranium(vi) bis(imido) complexes." Chemical Communications 56, no. 3 (2020): 431–34. http://dx.doi.org/10.1039/c9cc07411b.

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U(vi) trans-bis(imido) complexes [U(κ4{(tBu2ArO)2Me2-cyclam})(NPh)(NPhR)] react with CO2 to afford U(vi) trans-[OUNR]2+ complexes with elimination of isocyanates. These are unprecedented examples of CO2 cleavage mediated by U(vi) imido complexes.
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Maria, Leonor, and Joaquim Marçalo. "Uranyl Analogue Complexes—Current Progress and Synthetic Challenges." Inorganics 10, no. 8 (August 18, 2022): 121. http://dx.doi.org/10.3390/inorganics10080121.

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Uranyl ions, {UO2}n+ (n = 1, 2), display trans, strongly covalent, and chemically robust U-O multiple bonds, where 6d, 5f, and 6p orbitals play important roles. The synthesis of isoelectronic analogues of uranyl has been of interest for quite some time, mainly with the purpose of unveiling covalence and 5f-orbital participation in bonding. Significant advances have occurred in the last two decades, initially marked by the synthesis of uranium(VI) bis(imido) complexes, the first analogues with a {RNUNR}2+ core, later followed by the synthesis of unique trans-{EUO}2+ (E = S, Se) complexes, and recently highlighted by the synthesis of the first complexes featuring a linear {NUN} moiety. This review covers the synthesis, structure, bonding, and reactivity of uranium complexes containing a linear {EUE}n+ core (n = 0, 1, 2), isoelectronic to uranyl ions, {OUO}n+ (n = 1, 2), incorporating σ- and π-donating ligands that can engage in uranium–ligand multiple bonding, where oxygen may be replaced by heavier chalcogenido, imido, nitride, and carbene ligands, or by a transition metal. It focuses on synthetic methods of well-defined molecular uranium species in the condensed phase but also references gas-phase and low-temperature-matrix experiments, as well as computational studies that may lead to valuable insights.
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Hayton, Trevor W., James M. Boncella, Brian L. Scott, and Enrique R. Batista. "Exchange of an Imido Ligand in Bis(imido) Complexes of Uranium." Journal of the American Chemical Society 128, no. 39 (October 2006): 12622–23. http://dx.doi.org/10.1021/ja064400j.

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Spencer, Liam P., Ping Yang, Brian L. Scott, Enrique R. Batista, and James M. Boncella. "Imido Exchange in Bis(imido) Uranium(VI) Complexes with Aryl Isocyanates." Journal of the American Chemical Society 130, no. 10 (March 2008): 2930–31. http://dx.doi.org/10.1021/ja7107454.

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Brennan, John G., Jennifer C. Green, and Catherine M. Redfern. "A photoelectron study of pentavalent uranium imido complexes." Inorganica Chimica Acta 139, no. 1-2 (December 1987): 331–33. http://dx.doi.org/10.1016/s0020-1693(00)84111-0.

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Tomson, Neil C., Nickolas H. Anderson, Aaron M. Tondreau, Brian L. Scott, and James M. Boncella. "Oxidation of uranium(iv) mixed imido–amido complexes with PhEEPh and to generate uranium(vi) bis(imido) dichalcogenolates, U(NR)2(EPh)2(L)2." Dalton Transactions 48, no. 29 (2019): 10865–73. http://dx.doi.org/10.1039/c9dt00680j.

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Perales, Diana, Nathan J. Lin, Michaela R. Bronstetter, Shannon A. Ford, Matthias Zeller, and Suzanne C. Bart. "Conversion of Uranium(III) Anilido Complexes to Uranium(IV) Imido Complexes via Hydrogen Atom Transfer." Organometallics 41, no. 5 (February 18, 2022): 606–16. http://dx.doi.org/10.1021/acs.organomet.1c00680.

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Spencer, Liam P., Robyn L. Gdula, Trevor W. Hayton, Brian L. Scott, and James M. Boncella. "Synthesis and reactivity of bis(imido) uranium(vi) cyclopentadienyl complexes." Chemical Communications, no. 40 (2008): 4986. http://dx.doi.org/10.1039/b806075d.

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Tsoureas, Nikolaos, and F. Geoffrey N. Cloke. "Mixed sandwich imido complexes of Uranium(V) and Uranium(IV): Synthesis, structure and redox behaviour." Journal of Organometallic Chemistry 857 (February 2018): 25–33. http://dx.doi.org/10.1016/j.jorganchem.2017.08.019.

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Spencer, Liam P., Ping Yang, Brian L. Scott, Enrique R. Batista, and James M. Boncella. "Uranium(VI) Bis(imido) Chalcogenate Complexes: Synthesis and Density Functional Theory Analysis." Inorganic Chemistry 48, no. 6 (March 16, 2009): 2693–700. http://dx.doi.org/10.1021/ic802212m.

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Дисертації з теми "Uranium imido complexes"

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Vaughn, Anthony E. "High valent uranium dioxo and imido complexes synthesis and structure /." Diss., Columbia, Mo. : University of Missouri-Columbia, 2008. http://hdl.handle.net/10355/5596.

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Анотація:
Thesis (Ph. D.)--University of Missouri-Columbia, 2008.
The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed June 17, 2009). Vita. Includes bibliographical references.
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Fox, Alexander Ray 1979. "Nitride, imide, and azide chemistry of anilide-supported tungsten and uranium complexes by Alexander Ray Fox." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/58200.

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Анотація:
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemistry, 2010.
Vita. Page 213 blank. Cataloged from PDF version of thesis.
Includes bibliographical references.
The uranium(III) tris(anilide) complex (THF)U(N[t-Bu]Ar) 3 reacts with MN 3 (M = Na, [N(n-Bu) 4]) to form the bimetallic diuranium(IV/IV) salts M[(p-N)(U(N[t-Bu]Ar) 3)2]. The stability of the U=N=U core across multiple charge states is illustrated by stepwise chemical oxidation of Na[(p- N)(U(N[t-Bu]Ar) 3)2] to the corresponding neutral diuranium(V/IV) and cationic diuranium(V/V) derivatives. Metallonitrene-like reactivity for [(p-N)(U(N[t-Bu]Ar) 3)2][B(ArF) 4] is demonstrated by its reaction with NaCN. The uranium(IV) azide complex (N3)U(N[t-Bu]Ar)3 is prepared by the reaction of the uranium(IV) iodide complex IU(N[t-Bu]Ar)3 with NaN3. Photolysis or reduction of (N3)U(N[t-Bu]Ar) 3 leads to the bimetallic p-nitride system [(-N)(U(N[t-Bu]Ar) 3)2]". The reaction of (THF)U(N[t-Bu]Ar) 3 with the azidoborate salt [N(n-Bu) 4] [(C6F5)3B(N 3)] provides the uranium(V) nitridoborate complex [N(n-Bu) 4] [(C6F5)3BNU(N[t-Bu]Ar) 3], which leads to the neutral uranium(VI) derivative (C6F5)3BNU(N[t-Bu]Ar) 3 by way of le oxidation. A system of uranium complexes featuring bidentate anilide ligands has been developed. The syntheses of the bis(anilide) complexes [(Et20),Li][I2U(N[R]ArMeL)2] and 12U(N[R]ArMeL)2, and the tris(anilide) complexes U(N[R]ArMeL)3 and U(N[Np]ArMeL)3 are described. The N-tert-butylanilide derivative U(N[R]ArMeL)3 fails to react with a host of small molecule substrates but does react with AgOTf to form the separated ion pair [U(N[R]ArMeL)3][OTf], suggesting a high degree of steric encumbrance about the metal center. The N-neopentylanilide derivative U(N[Np]ArMeL)3 reacts with pyridine-N-oxide to form the uranium(V) terminal oxo complex OU(N[Np]ArMeL)3, and with NaN3 to provide the "-ate" complex [Na(THF)6] [(p, T - N3 )(U(N[Np]ArMeL)3)2]- The tungsten(VI) terminal nitride complex NW(N[t-Bu]Ar) 3 is obtained in low but reproducible yield through a route independent of dinitrogen chemistry. The reaction of NW(N[t-Bu]Ar) 3 with electrophiles R-X (R-X = PhC(O)OTf; Mel) provides the four-coordinate imido salts [RNW(N[t-Bu]Ar) 3][X]. The siloxy-substituted ketimide complex Ph(Me 3SiO)CNW(N[t-Bu]Ar) 3 is obtained by reduction and silylation of the benzoylimido salt. In contrast to the chemistry displayed by a related Mo-based system, no reactions that lead to the elimination of PhCN from Ph(Me 3SiO)CNW(N[t-Bu]Ar)3 were uncovered. The parent ketimide complex H2CNW(N[t- Bu]Ar)3 reacts with electrophiles R'-X (R'-X = Me3SiOTf; [Ph 2P][AlC4l4) through the ketimide carbon, providing the substituted methylimido salts [R'CH2NW(N[t-Bu]Ar) 3][X], which in turn provide the substituted ketimide complexes R'(H)CNW(N[t-Bu]Ar) 3 by deprotonation.
Ph.D.
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