Chromophore Dipole Directs Morphology and Photocatalytic Hydrogen Generation
Journal Article
·
· Journal of the American Chemical Society
- Northwestern Univ., Evanston, IL (United States); CBES
- Northwestern Univ., Evanston, IL (United States)
- Northwestern Univ., Chicago, IL (United States)
- Northwestern Univ., Evanston, IL (United States); Northwestern Univ., Chicago, IL (United States)
The spontaneous self-assembly of chromophores into light-harvesting antennae provides a potentially low-cost approach to building solar-to-fuel conversion materials. However, designing such supramolecular architectures requires a better understanding of the balance between noncovalent forces among the molecular components. Here, we investigated the aqueous assembly of perylene monoimide chromophore amphiphiles synthesized with different substituents in the 9-position. The molecular dipole strength decreases as the nature of the substituent is altered from electron donating to electron withdrawing. Compounds with stronger molecular dipoles, in which dipolar interactions stabilize assemblies by 10–15 kJ·mol–1, were found to form crystalline nanoribbons in solution. In contrast, when the molecular dipole moment is small, nanofibers were obtained. Highly blue-shifted absorption maxima were observed in assemblies with large dipoles, indicating strong electronic coupling is present. However, only the moderate dipole compound had the appropriate molecular packing to access charge-transfer excitons leading to enhanced photocatalytic H2 production.
- Research Organization:
- Energy Frontier Research Centers (EFRC) (United States). Argonne-Northwestern Solar Energy Research Center (ANSER); Energy Frontier Research Centers (EFRC) (United States). Center for Bio-Inspired Energy Science (CBES); Northwestern Univ., Evanston, IL (United States)
- Sponsoring Organization:
- National Center for Research Resources; National Institutes of Health (NIH); USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357; SC0001059
- OSTI ID:
- 1821915
- Alternate ID(s):
- OSTI ID: 1846786
OSTI ID: 1434718
- Journal Information:
- Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 15 Vol. 140; ISSN 0002-7863
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
77 NANOSCIENCE AND NANOTECHNOLOGY
Chromophores
Molecular packing
Molecular packing
Nanostructures
Supramolecular structures and assemblies
Chromophores
Molecular structure
Molecular structure
Nanostructures
Supramolecular structures and assemblies
77 NANOSCIENCE AND NANOTECHNOLOGY
Chromophores
Molecular packing
Molecular packing
Nanostructures
Supramolecular structures and assemblies
Chromophores
Molecular structure
Molecular structure
Nanostructures
Supramolecular structures and assemblies