Zobrazeno 1 - 10
of 15
pro vyhledávání: '"35"'
Autor:
Peter Gast, J. S. van den Brink, S. A. M. Nieuwenhuis, Jan Raap, Johan Lugtenburg, Arnold J. Hoff, R. J. Hulsebosch
Publikováno v:
Journal of the American Chemical Society. 119:8685-8694
Selective 2H-, 13C-, and 17O-isotope labeling of the tyrosine amino acid has been used to map the unpaired π-electron spin-density distribution of the UV-generated neutral l-tyrosine phenoxy radical in alkaline frozen solution. The use of 13C and 17
Autor:
Y. Maeda, K. U. Ingold
Publikováno v:
Journal of the American Chemical Society. 102:328-331
A search for a dialkylaminyl radical which rearranges at a rate suitable for study by kinetic EPR spectroscopy has shown that cyclobutyl-n-propylaminyl is such a species. This radical undergoes ring opening, and the rate constant for this process can
Publikováno v:
Journal of the American Chemical Society. 138:2500-2503
The synthesis and isolation of stable main group radicals remains an ongoing challenge. Here we report the application of frustrated Lewis pair chemistry to the synthesis of boron-containing radicals. H2 activation with polyaromatic diones and B(C6F5
Autor:
Johannes A. M. Hepperle, Brooks J. Culotta, Gerhard Erker, Allan Jay P. Cardenas, Stefan Grimme, Jeffrey L. Petersen, Roland Fröhlich, Armido Studer, Timothy H. Warren, Gerald Kehr, Constantin G. Daniliuc, Annika Stute, Birgitta Schirmer, Muhammad Sajid
Publikováno v:
Journal of the American Chemical Society
The intramolecular cyclohexylene-bridged P/B frustrated Lewis pair [Mes(2)P-C(6)H(10)-B(C(6)F(5))(2)] 1b reacts rapidly with NO to give the persistent FLP-NO aminoxyl radical 2b formed by P/B addition to the nitrogen atom of NO. This species was full
Autor:
Robert J. Doedens, Filipp Furche, Joseph W. Ziller, David S. Lee, William J. Evans, Ming Fang, Jefferson E. Bates
Publikováno v:
Journal of the American Chemical Society. 133:3784-3787
Examination of the Y[N(SiMe(3))(2)](3)/KC(8) reduction system that allowed isolation of the (N(2))(3-) radical has led to the first evidence of Y(2+) in solution. The deep-blue solutions obtained from Y[N(SiMe(3))(2)](3) and KC(8) in THF at -35 °C u
Autor:
Mohammad R. Seyedsayamdost, Tomislav Argirević, JoAnne Stubbe, Ellen Catherine Minnihan, Marina Bennati
Publikováno v:
Journal of the American Chemical Society
E. coli ribonucleotide reductase (RNR) catalyzes the conversion of nucleotides to deoxynucleotides, a process that requires long-range radical transfer over 35 A from a tyrosyl radical (Y(122)*) within the beta2 subunit to a cysteine residue (C(439))
Autor:
E. C. Abresch, and Melvin Y. Okamura, George Feher, Rafael Calvo, Mark L. Paddock, Wolfgang Lubitz, Wulf Hofbauer, Robert Bittl, R.A. Isaacson
Publikováno v:
Journal of the American Chemical Society. 122:7327-7341
The photocycle of bacterial photosynthetic reaction centers (RCs) involves electron transfer between two quinone molecules, QA and QB. The semiquinone biradical QA-•QB-• forms an intermediate state in this process. We trapped the biradical at low
Publikováno v:
Journal of the American Chemical Society. 121:4859-4876
Reaction of cis-[FeIII(cyclam)Cl2]Cl in acidic H2O/CH3OH or CH3CN/H2O mixtures with NaN3 at 50 °C produced upon addition of NaClO4 or NaPF6 the complex trans-[FeIII(cyclam)(N3)2]ClO4 (1a) or the hexafluorophosphate salt 1b, whereas at −18 °C the
Autor:
Edward I. Solomon, Frank Neese
Publikováno v:
Journal of the American Chemical Society. 120:12829-12848
A spectroscopic study of the Fe(III)−EDTA−peroxide complex using electron paramagnetic resonance (EPR), low-temperature absorption (LT-ABS), variable-temperature−variable-field (VTVH) magnetic circular dichroism (MCD), and resonance Raman (rR)
Publikováno v:
Journal of the American Chemical Society. 119:10121-10126
The resting state of nitrogenase shows an S = 3/2 electron paramagnetic resonance (EPR) signal resulting from the FeMo-cofactor (MoFe7S9:homocitrate) of the MoFe protein. When the enzyme undergoes turnover under a CO atmosphere, this signal disappear