Expanding Covalent Attachment Sites of Nonnative Chromophores to Encompass the C-Terminal Hydrophilic Domain in Biohybrid Light-Harvesting Architectures
Abstract Increasing the solar spectral coverage of native photosynthetic antennas can be achieved using biohybrid light‐harvesting (LH) structures comprised of native‐like bacterial photosynthetic peptides and synthetic bacteriochlorins with strong near‐infrared absorption. Four such biohybrids have been prepared wherein synthetic maleimido‐bearing bacteriochlorin BC1‐mal is covalently attached to a Cys residue substituted at either the +1, +5 or +11 position (relative to His‐0) of the 48‐residue β‐peptide of Rb. sphaeroides LH1. In addition, a β‐peptide with Phe substituted for Tyr at the +4 position along with +1Cys was used to examine possible quenching of the excited BC1 by the Tyr. The β‐peptide analogs, as well as their peptide‐ BC1 conjugates when combined with native α‐peptide, and bacteriochlorophyll a ( BChl a ) self‐assemble to form αβ‐dyads and therefrom LH1‐type cyclic (αβ) n oligomers. Static and time‐resolved optical studies show that all of the oligomeric assemblies transfer excitation energy from the appended BC1 to the BChl a array ( B875 ) with an average efficiency of 85 %.
- Research Organization:
- Washington Univ., St. Louis, MO (United States). Photosynthetic Antenna Research Center (PARC)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- SC0001035
- OSTI ID:
- 1470056
- Alternate ID(s):
- OSTI ID: 1419902
- Journal Information:
- ChemPhotoChem, Vol. 2, Issue 3; Related Information: PARC partners with Washington University in St. Louis (lead); University of California, Riverside; University of Glasgow, UK; Los Alamos National Laboratory; University of New Mexico; New Mexico Corsortium; North Carolina State University; Northwestern University; Oak Ridge National Laboratory; University of Pennsylvania; Sandia National Laboratories; University of Sheffield, UK; ISSN 2367-0932
- Country of Publication:
- United States
- Language:
- English
Web of Science
A bacteriochlorin-diketopyrrolopyrrole triad as a donor for solution-processed bulk heterojunction organic solar cells
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journal | January 2019 |
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