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Reaction centers are pigment-protein complexes that initiate energy conversion from photons to chemical entities. Therefore, photochemical reaction center is a more appropriate term that describes these complexes. The Nobel laureates Robert Emerson and William Arnold provided the first experimental evidence of photochemical reaction centers by demonstrating the participation of nearly 2,500 chlorophyll molecules for the release of just one molecule of oxygen. Despite thousands of photosynthetic...
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Plants and other photosynthetic organisms comprise pigments capable of absorption of direct sunlight. These pigments are present in the reaction center - the main site of photochemical reactions as well as in the antenna complex. Under average light conditions, the rate at which reaction center pigments absorb light is far below the electron transport chain's capacity. As a result, the reaction center alone cannot provide enough energy to drive photosynthesis. The photosynthetic efficiency can...
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Although structurally similar to photosystem II (PSII), photosystem I (PSI) is has a different electron supplier and electron acceptor.
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The multi-protein complex photosystem II (PS II) harvests photons and transfers their energy through its bound pigments to its reaction center, and ultimately to photosystem I (PSI) through the electron transport chain. The pigments responsible for caputirng the light energy in photosystems include chlorophyll a, chlorophyll b, and carotenoids.
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Un compuesto fotorreactivo de hierro (II)

Wolfgang Leis1, Miguel A Argüello Cordero2, Stefan Lochbrunner2

  • 1Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, 72076 Tübingen, Germany.

Journal of the American Chemical Society
|January 13, 2022
PubMed
Resumen

Este estudio introduce un nuevo complejo de hierro para la conversión de luz en energía. Este cromóforo luminiscente, que presenta un estado de transferencia de carga triple de metal a ligando, demuestra una emisión eficiente en el infrarrojo cercano y fotorreactividad para la síntesis.

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Área de la Ciencia:

  • La fotoquímica
  • Química inorgánica
  • Ciencias de los materiales

Sus antecedentes:

  • El control de los estados excitados es clave para la conversión de luz en energía en los sistemas moleculares.
  • Los complejos de rutenio son sensibilizantes comunes, pero se buscan alternativas.

Objetivo del estudio:

  • Informar de un nuevo complejo luminiscente y fotorreactivo de hierro (II).
  • Para investigar sus propiedades de estado excitado y aplicaciones potenciales en la síntesis impulsada por la luz.

Principales métodos:

  • Síntesis de un complejo de hierro ciclometalizado doble con un marco de fenilfenantrolina.
  • Caracterización de sus propiedades fotofísicas, incluida la desintegración de la luminiscencia y el potencial redox en estado excitado.
  • Demostración de su uso en una reacción de acoplamiento radical.

Principales resultados:

  • El complejo de hierro llena un estado de transferencia de carga triple de metal a ligando (MLCT) como el estado excitado de menor energía.
  • Se observó una luminiscencia en el infrarrojo cercano con una vida útil de 1-2,4 ns en diferentes fases y 14 ns a 77 K.
  • El complejo exhibe un potencial redox de estado excitado MLCT de -2 V frente a Fc / Fc +.
  • Aplicación exitosa en el acoplamiento radical de 4-clorobromobenzeno y benceno.

Conclusiones:

  • El complejo de hierro desarrollado es un sensibilizador de alto rendimiento, análogo a los complejos de rutenio.
  • Sus propiedades favorables de estado excitado, incluida la luminiscencia NIR y el potencial redox, permiten su uso en la síntesis impulsada por la luz.
  • Este trabajo amplía el alcance de los cromóforos basados en metales para transformaciones químicas sostenibles.