Výsledky vyhledávání - "Nora Y. Nelson"

Ruffling in a Series of Nickel(II) meso-Tetrasubstituted Porphyrins as a Model for the Conserved Ruffling of the Heme of Cytochromes c

Autor: Kevin M. Smith, John A. Shelnutt, M. Veyrat, J. D. Hobbs, William A. Goddard, X.Z. | Song, Marinella Mazzanti, Jean-Claude Marchon, Tadashi Ema, Nora Y. Nelson, René Ramasseul, Craig J. Medforth, Walter Jentzen, M. C. Simpson, Toshihiko Takeuchi

Publikováno v: Journal of the American Chemical Society. 117(45)

Metalloporphyrins undergo remarkable nonplanar distortions of the macrocycle that perturb the chemical and photochemical properties of these important protein cofactors. Further, the tertiary structure of the surrounding protein can manipulate these

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::63c2e6a66da7483742fa4a55a983bcc9
https://pubmed.ncbi.nlm.nih.gov/27275517

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Conformational control of oxidation sites, spin states and orbital occupancy in nickel porphyrins

Autor: Kathleen M. Barkigia, Mark W. Renner, Nora Y. Nelson, Jack Fajer, Jean-Paul Gisselbrecht, Kevin M. Smith, Dan Melamed

Publikováno v: Research on Chemical Intermediates. 28:741-759

Ni(II) porphyrin π cation radicals are known to undergo an internal electronic isomerization to L2Ni(III) cations upon complexation with ligands (L). Additional examples of the Ni(II) to Ni(III) conversion are presented for flexible, 'planar' NiOEP

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::fe7f40ee64f97b2f5f2070b1ab7517bc
https://doi.org/10.1163/15685670260469393

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Structural Consequences of Spin Conversion in a Sterically Encumbered Ni(II) Porphyrin

Autor: Mark W. Renner, J. Fajer, Kevin M. Smith, K. M. Barkigia, Nora Y. Nelson

Publikováno v: The Journal of Physical Chemistry B. 103:8643-8646

The crystal structure of a pyridine-ligated, high-spin Ni(II) complex of 2,3,7,8,12,13,17,18-octabromo-5,15-bis(isopropyl)-10,20-bis(isopropylidenyl) porphyrin, 2, is reported and compared to the unligated, low-spin Ni(II) complex, 1, previously repo

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3c0b67f5831b9b46168747b4d9f5cf15
https://doi.org/10.1021/jp992508y

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Synthesis, Reactivity and Structural Chemistry of 5,10,15,20-Tetraalkylporphyrins

Autor: Nora Y. Nelson, Ines Bischoff, Kevin M. Smith, Mathias O. Senge

Publikováno v: Journal of Porphyrins and Phthalocyanines. :99-116

The synthesis, reactivity and full characterization of a series of meso-tetraalkyl porphyrins and metalloporphyrins with R ≡ n-butyl (6), 2-methyl-propyl (7), isopropyl (8), l-ethyl-propyl (10) and tert-butyl (11) groups are reported. Derivatives o

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::034b6a51ddcfeedeab39e7adf4fba1b6
https://doi.org/10.1002/(sici)1099-1409(199902)3:2<99::aid-jpp109>3.0.co

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Picosecond to Microsecond Photodynamics of a Nonplanar Nickel Porphyrin: Solvent Dielectric and Temperature Effects

Autor: Charles Michael Drain, Steve Gentemann, James A. Roberts, Nora Y. Nelson, Craig J. Medforth, Songling Jia, M. Cather Simpson, Kevin M. Smith, Jack Fajer, John A. Shelnutt, Dewey Holten

Publikováno v: Journal of the American Chemical Society. 120:3781-3791

The lifetime of the (dz2,dx2-y2) metal excited state of nickel(II) 5,10,15,20-tetra-tert-butylporphyrin (NiT(t-Bu)P) exhibits an extraordinary dependence on solvent dielectric properties and temperature. At room temperature, the excited-state deactiv

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::46bf021fa3ae46cb0438f230f96fe1de
https://doi.org/10.1021/ja974101h

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Variations and Temperature Dependence of the Excited State Properties of Conformationally and Electronically Perturbed Zinc and Free Base Porphyrins

Autor: Kevin M. Smith, Nora Y. Nelson, Craig J. Medforth, Daniel J. Nurco, Laurent Jaquinod, and Jack Fajer, Steve Gentemann, Dewey Holten, Sam H. Leung

Publikováno v: The Journal of Physical Chemistry B. 101:1247-1254

The photophysical properties and their temperature dependence are reported for the sterically encumbered nonplanar zinc and free base 2,3,5,7,8,10,12,13,15,17,18,20-dodecaphenylporphyrins (ZnDPP and H2DPP), and 2,3,7,8,12,13,17,18-octaethyl-5,10,15,2

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::3c0462789dadf1ef8be636015a4d61df
https://doi.org/10.1021/jp9631137

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Unusual picosecond 1(π, π∗) deactivation of ruffled nonplanar porphyrins

Autor: Nora Y. Nelson, Kevin M. Smith, Jack Fajer, Craig J. Medforth, Tadashi Ema, Steve Gentemann, Dewey Holten

Publikováno v: Chemical Physics Letters. 245:441-447

Time-resolved and steady-state optical data are presented for metal-free meso-tetraalkylporphyrins, H 2 T(alkyl)P. Introduction of bulky tertiary-butyl or adamantyl substituents at the meso positions induces large ruffling distortions of the macrocyc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0a71a6565e0d983dfa4a4f207c1dbc80
https://doi.org/10.1016/0009-2614(95)01030-d

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ChemInform Abstract: Synthesis and Unusual Properties of the First 2,3,7,8,12,13,17,18-Octabromo-5,10,15,20-tetraalkylporphyrin

Autor: Song-Ling Jia, John A. Shelnutt, Daniel J. Nurco, Kevin M. Smith, Craig J. Medforth, Nora Y. Nelson

Publikováno v: ChemInform. 31

The new perhalogenated porphyrin 2,3,7,8,12,13,17,18-octabromo-5,10,15,20-tetrakis(trifluoromethyl)porphinato-nickel(II) exhibits several striking features, including an extremely ruffled macrocycle with a very short Ni-N distance, an unusually red-s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::6eb4dafd581ae8a5e7d4b44c66dbca44
https://doi.org/10.1002/chin.200005123

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