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Title: Control over Charge Separation by Imine Structural Isomerization in Covalent Organic Frameworks with Implications on CO2 Photoreduction

Journal Article · · Journal of the American Chemical Society
 [1];  [2]; ORCiD logo [3]; ORCiD logo [4];  [3];  [5];  [3];  [6]; ORCiD logo [7]; ORCiD logo [7]; ORCiD logo [8]; ORCiD logo [6]; ORCiD logo [5]; ORCiD logo [9]
  1. Marquette University, Milwaukee, WI (United States); Boston College
  2. Magnitude Instruments, State College, PA (United States)
  3. Boston College, Chestnut Hill, MA (United States)
  4. University of Nebraska-Lincoln, NE (United States)
  5. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  6. Wayne State University, Detroit, MI (United States)
  7. University of Wisconsin-Madison, WI (United States)
  8. Northwestern University, Evanston, IL (United States)
  9. Marquette University, Milwaukee, WI (United States); Boston College, Chestnut Hill, MA (United States)

Two-dimensional covalent organic frameworks (COFs) are an emerging class of photocatalytic materials for solar energy conversion. In this work, we report a pair of structurally isomeric COFs with reversed imine bond directions, which leads to drastic differences in their physical properties, photophysical behaviors, and photocatalytic CO2 reduction performance after incorporating a Re(bpy)(CO)3Cl molecular catalyst through bipyridyl units on the COF backbone (Re-COF). Using the combination of ultrafast spectroscopy and theory, we attributed these differences to the polarized nature of the imine bond that imparts a preferential direction to intramolecular charge transfer (ICT) upon photoexcitation, where the bipyridyl unit acts as an electron acceptor in the forward imine case (f-COF) and as an electron donor in the reverse imine case (r-COF). These interactions ultimately lead the Re-f-COF isomer to function as an efficient CO2 reduction photocatalyst, while the Re-r-COF isomer shows minimal photocatalytic activity. Furthermore, these findings not only reveal the essential role linker chemistry plays in COF photophysical and photocatalytic properties but also offer a unique opportunity to design photosensitizers that can selectively direct charges.

Research Organization:
Boston College, Chestnut Hill, MA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)
Grant/Contract Number:
SC0024049; AC02-06CH11357; AC02-05CH11231
OSTI ID:
2335686
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Journal Issue: 7 Vol. 146; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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