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Structures, Electrochemistry and Reactivities of Ruthenium Porphyrins Containing Imido or Conjugated Amido/Iminato Ligands: (English)

Structures, Electrochemistry and Reactivities of Ruthenium Porphyrins Containing Imido or Conjugated Amido/Iminato Ligands: (English)

          
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This dissertation, "Structures, electrochemistry and reactivities of ruthenium porphyrins containing imido or conjugated amido/iminato ligands" by Wai-man, Tsui, 徐慧敏, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled STRUCTURES, ELECTROCHEMISTRY AND REACTIVITIES OF RUTHENIUM PORPHYRINS CONTAINING IMIDO OR CONJUGATED AMIDO/IMINATO LIGANDS Submitted by Tsui Wai Man for the degree of Doctor of Philosophy at The University of Hong Kong in Jun 2006 Metal-nitrogen multiple bonded species such as metal imido complexes play a key role in catalytic C-N bond formation reactions. This thesis is focused on the chemistry of quinoneimido (or conjugated iminato), arylamido and arenesulfonylimido ruthenium porphyrins, with particular attention paid to the driving force dependence of the rate constants of the imido transfer from metal imido complexes to alkenes and C-H bonds. Related chemistry of dioxoruthenium porphyrins and efforts to develop water-soluble ruthenium porphyrin oxidation catalysts are also described. Treatment of dioxoruthenium(VI) porphyrins with 2,6-dimethylaniline or 2,6-dichloroaniline in ethanol afforded quinoneimido ruthenium porphyrins IV 1 1 [Ru (Por)(NQu)(OEt)] (Por = porphyrinato dianion, HNQu = IV 2 N-(2',6'-dimethyl)phenyl-2,6-dimethyl-quinonediimine) and [Ru (Por)(NQu )(OEt)] (Por = TTP, HNQu = N-(2',6'-dichloro)phenyl-2,6-dichloro-quinonediimine). These IV 1 complexes underwent hydrolysis to give [Ru (Por)(NQu)(OH)] and IV 2 [Ru (Por)(NQu)(OH)]. Upon treatment with NaOMe, PhOH, CHCOOH and IV 1 CF COOH in CH Cl, [Ru (TTP)(NQu )(OH)] was quantitatively converted to 3 2 2 IV 1 [Ru (TTP)(NQu )(OR)] (R = Me, Ph, CH CO and CF CO, respectively). X-ray 3 3 IV 1 crystal structures of [Ru (TTP)(NQu)(OEt)] (HTTP = IV 1 meso-tetrakis(p-tolyl)porphyrin) and [Ru (4-OMe-TPP)(NQu )(OEt)] (H (4-OMe-TPP) = meso-tetrakis(4-methoxyphenyl)porphyrin) both feature linear terminal quinoneimido groups, with short Ru-N(quinoneimido) bond distances of 1.788-1.805 A. Reactions of dioxoruthenium(VI) porphyrins with a variety of conjugated arylamines (such as biphenyl- and terphenylamine, phenylethynyl-phenylamine and fluoren-2-ylamine) in ethanol or dichloromethane gave ruthenium(IV) porphyrins bearing conjugated arylamido ligands. The spectroscopic and electrochemical properties and X-ray crystal structures of these complexes were compared with those of ruthenium(IV) porphyrins bearing simple arylamido ligands. VI Bis(arenesulfonylimido)ruthenium(VI) porphyrins [Ru (TMP)(NSO R) ] 2 2 (HTMP = meso-tetramesitylporphyrin) (SOR = Ms, Ts, Bs, Cs, Ns) and 2 2 VI [Ru (Por)(NTs) ] underwent imido transfer reactions with alkenes and C-H bonds to afford aziridines or amides. The cyclic voltammograms of these metal imido VI/V complexes show the Ru reduction couple in the range of -0.41 to -0.12 V vs +/0 Cp Fe . A more strongly electron-withdrawing R group or porphyrin ligand resulted VI/V VI/V in a more anodic E (Ru ) value. The E (Ru ) values linearly correlate with log 1/2 1/2 k (second-order rate constants) for the imido transfer reactions of VI [Ru (TMP)(NSO R)] with styrene, ethylbenzene, toluene, cumene and 2 2 tetrahydrofuran. A linear correlation was also observed between log k′ (k divided by the number of reactive C-H bonds) and the C-H bond dissociation energies of VI hydrocarbons for their C-H bond amidations by [Ru (TMP)(NNs)] and VI [Ru (F -TPP)(NTs)] (H (F-TPP) = 20 2 2 20 5,10,15,20-tetrakis(pentafluorophenyl)porp


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Product Details
  • ISBN-13: 9781361425756
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 274
  • Spine Width: 15 mm
  • Width: 216 mm
  • ISBN-10: 136142575X
  • Publisher Date: 27 Jan 2017
  • Binding: Paperback
  • Language: English
  • Series Title: English
  • Weight: 640 gr


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