Investigations of biomimetic light energy harvesting pigments

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This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). Nature uses chlorophyll and other porphyrinic pigments to capture and transfer light energy as a preliminary step in photosynthesis. The design of synthetic assemblies of light harvesting and energy directing pigments has been explored through synthesis and characterization of porphyrin oligomers. In this project, pigment electronic and vibrational structures have been explored by electrochemistry and dynamic and static optical measurements. Transient absorption data reveal energy transfer between pigments with lifetimes on the order of 20--200 picoseconds, while Raman data ... continued below

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6 p.

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Van Patten, P.G.; Donohoe, R.J.; Lindsey, J.S. & Bocian, D.F. December 1, 1998.

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Description

This is the final report of a three-year, Laboratory Directed Research and Development (LDRD) project at Los Alamos National Laboratory (LANL). Nature uses chlorophyll and other porphyrinic pigments to capture and transfer light energy as a preliminary step in photosynthesis. The design of synthetic assemblies of light harvesting and energy directing pigments has been explored through synthesis and characterization of porphyrin oligomers. In this project, pigment electronic and vibrational structures have been explored by electrochemistry and dynamic and static optical measurements. Transient absorption data reveal energy transfer between pigments with lifetimes on the order of 20--200 picoseconds, while Raman data reveal that the basic porphyrin core structure is unperturbed relative to the individual monomer units. These two findings, along with an extensive series of experiments on the oxidized oligomers, reveal that coupling between the pigments is fundamentally weak, but sufficient to allow facile energy transfer as the predominant excited state process. Modeling of the expected quantum yields for energy transfer within a variety of arrays was accomplished, thereby providing a tool to guide synthetic goals.

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6 p.

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OSTI as DE99001265

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  • Other Information: PBD: [1998]

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  • Other: DE99001265
  • Report No.: LA-UR--98-2617
  • Grant Number: W-7405-ENG-36
  • DOI: 10.2172/296683 | External Link
  • Office of Scientific & Technical Information Report Number: 296683
  • Archival Resource Key: ark:/67531/metadc687672

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Office of Scientific & Technical Information Technical Reports

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  • December 1, 1998

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  • July 25, 2015, 2:20 a.m.

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  • May 20, 2016, 2:53 p.m.

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Van Patten, P.G.; Donohoe, R.J.; Lindsey, J.S. & Bocian, D.F. Investigations of biomimetic light energy harvesting pigments, report, December 1, 1998; New Mexico. (digital.library.unt.edu/ark:/67531/metadc687672/: accessed December 17, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.