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DC Field | Value | Language |
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dc.contributor.author | Reddy, K.R. | en_US |
dc.contributor.author | Pandithavidana, D.R. | en_US |
dc.contributor.author | Parkes-Loach, P.S. | en_US |
dc.contributor.author | Loach, P.A. | en_US |
dc.contributor.author | Bocian, D.F. | en_US |
dc.contributor.author | Holten, D. | en_US |
dc.contributor.author | Lindsey, J.S. | en_US |
dc.date.accessioned | 2014-11-19T04:40:18Z | - |
dc.date.available | 2014-11-19T04:40:18Z | - |
dc.date.issued | 2013 | - |
dc.identifier.uri | http://repository.kln.ac.lk/handle/123456789/3797 | - |
dc.description.abstract | The challenge of creating both pigment building blocks and scaffolding to organize a large number of such pigments has long constituted a central impediment to the construction of artificial light-harvesting architectures. Light-harvesting (LH) antennas in photosynthetic bacteria are formed in a two-tiered self-assembly process wherein (1) a peptide dyad containing two bacteriochlorophyll a molecules forms, and (2) the dyads associate to form cyclic oligomers composed of 8 or 9 dyads in LH2 and 15 or 16 in LH1 of purple photosynthetic bacteria. While such antenna systems generally have near-quantitative transfer of excitation energy among pigments, only a fraction of the solar spectrum is typically absorbed. A platform architecture for study of light-harvesting phenomena has been developed that employs native photosynthetic peptide analogs, native bacteriochlorophyll a, and synthetic near-infrared-absorbing bacteriochlorins. Herein, the syntheses of 10 lipophilic bacteriochlorins are reported, of which 7 contain bioconjugatable handles (maleimide, iodoacetamide, formyl, carboxylic acid) for attachment to the peptide chassis. The bioconjugatable bacteriochlorins typically exhibit a long-wavelength absorption band in the range 710 to 820 nm, fluorescence yield of 0.1?0.2, and lifetime of the lowest singlet excited state of 2?5 ns. The ?-helical structure of the native-like peptide is retained upon conjugation with a synthetic bacteriochlorin, as judged by single-reflection infrared studies. Static and time-resolved optical studies of the oligomeric biohybrid architectures in aqueous detergent solution reveal efficient ([similar]90%) excitation energy transfer from the attached bacteriochlorin to the native-like bacteriochlorophyll a sites. The biohybrid light-harvesting architectures thus exploit the self-constituting features of the natural systems yet enable versatile incorporation of members from a palette of synthetic chromophores, thereby opening the door to a wide variety of studies in artificial photosynthesis. | en_US |
dc.publisher | Chemical Science | en_US |
dc.title | Palette of lipophilic bioconjugatable bacteriochlorins for construction of biohybrid light-harvesting architectures | - |
dc.type | article | en_US |
dc.identifier.department | Chemistry | en_US |
Appears in Collections: | Chemistry |
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