Library

X
feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Calculations, force-field, MNDO  (1)
  • Electron transfer  (1)
  • Elektronentransfer  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Modellreaktionen für die Photosynthese - photoinduzierter Ladungs- und Energietransfer zwischen verknüpften Porphyrin- und Chinon-EinheitenProfessor Fabian Gerson gewidmet (1995)
    Weinheim : Wiley-Blackwell
    Zeitschrift für die chemische Industrie 107 (1995), S. 929-947 
    Details
    ISSN: 0044-8249
    Keywords: Chinone ; Elektronentransfer ; Energietransfer ; Photosynthese ; Porphyrinoide ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Die Photosynthese gehört zu den faszinierenden Feldern aktueller interdisziplinärer Forschung. Es ist wohl ein Wunder, wie die Natur es im Verlauf der Evolution vollbringen konnte, die im Primärschritt der Photosynthese in den Reaktionszentren aus dem photoangeregten Singulettzustand des (Bakterio)Chlorophylldonors heraus erfolgende Ladungstrennung mit einer Quantenausbeute von 100% zu bewerkstelligen, obwohl der einfache Rücktransfer des angeregten Elektrons in den Grundzustand so favorisiert wäre. An biomimetischen, d.h. der Natur nachempfundenen, aus Porphyrinen und Chinonen aufgebauten Modellverbindungen können die Faktoren studiert werden, die die hohe Effizienz der Ladungstrennung bewirken. In diesem Bericht sollen jüngste Untersuchungen an Porphyrinchinonen zum Elektronentransfer im Vordergrund stehen, wobei die Interpretationen der Ergebnisse durchaus nicht in allen Fällen abgeschlossen und häufig sogar noch Gegenstand kontroverser Diskussion sind.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/ange.19951070804
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 2
    Electronic Resource
    Electronic Resource
    Darstellung von aliphatisch und cycloaliphatisch verbrückten Porphyrin-Chinonen als Modellverbindungen zur Untersuchung der lichtinduzierten Ladungstrennung in der Photosynthese (1993)
    Weinheim : Wiley-Blackwell
    Liebigs Annalen 1993 (1993), S. 897-903 
    Details
    ISSN: 0170-2041
    Keywords: Porphyrins ; Quinones ; Cyclohexanes, 1,4-disubstituted ; Photochemistry ; Calculations, force-field, MNDO ; Chemistry ; Organic Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Synthesis of Porphyrin Quinones with Aliphatic and Cycloaliphatic Bridges as Model Compounds for Studying the Light-Induced Charge Separation in PhotosynthesisCovalently linked porphyrin quinones (P-Qs) are well-suited as biomimetic model compounds in studying the light-induced charge separation occuring in primary processes of photosynthesis. We report on a synthetic strategy which leads to P-Qs with the porphyrin donor covalently linked to the quinone acceptor via aliphatic and cycloaliphatic spacers. Preparation of two diastereomeric cyclohexylene-bridged P-Qs 1 and 2 and of 3 bearing a butylene spacer is described. Structures, including the spatial arrangements of the donor, bridge and acceptor, are determined by various NMR techniques. These data are compared with those deduced from simple force-field calculations using the molecular modelling program ALCHEMY II (Tripos Associates) and MNDO (MOPAC-6) calculations.
    Additional Material: 1 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/jlac.1993199301141
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Model Reactions for Photosynthesis - Photoinduced Charge and Energy Transfer between Covalently Linked Porphyrin and Quinone UnitsDedicated to Professor Fabian Gerson (1995)
    Weinheim : Wiley-Blackwell
    Angewandte Chemie International Edition in English 34 (1995), S. 849-866 
    Details
    ISSN: 0570-0833
    Keywords: electron transfer ; energy transfer ; photosynthesis ; porphyrins ; quinones ; Photosynthesis ; Porphyrinoids ; Quinones ; Electron transfer ; Chemistry ; General Chemistry
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: Photosynthesis is one of the fascinating fields of current interdisciplinary research. It seems miraculous that nature, in the process of evolution, has managed to bring about the process of photosynthesis. The first step involves a charge separation at the reaction centers, which proceeds with 100% quantum yield from the photoexcited singlet state of the bacteriochlorophyll donor, despite the fact that the wasteful deactivation of the electron into the ground state should be highly favored. Biomimetic model compounds (that is, those which resemble the pigments nature has developed) have been constructed from porphyrins and quinones. These model systems have allowed the study of the factors contributing to the highly efficient charge separation. This report focuses on recent developments in the study of electron transfer in porphyrinoquinones. Some of the results of these investigations may not be not fully understood and are often the subject of controversial discussions.
    Additional Material: 10 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/anie.199508491
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
    Paper (German National Licenses)
    Fulltext
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...