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Title: Layered structures of assembled imine-linked macrocycles and two-dimensional covalent organic frameworks give rise to prolonged exciton lifetimes

Abstract

Ordered organic materials and assemblies have great potential to be tailored to have desirable properties for optoelectronic applications, such as long exciton lifetime and high directional exciton mobility. Framework materials, such as two-dimensional covalent organic frameworks (2D COFs), as well as their truncated macrocyclic analogues, are versatile platforms to organize functional aromatic systems into designed assemblies and robust materials. In this study we investigate the exciton dynamics in a 2D COF, its corresponding hexagonal macrocycle, and extended nanotubes comprised of stacked macrocycles. The excitonic behavior of these three systems provide an understanding of excitonic processes that occur in the plane of the covalently bonded 2D macromolecules and between layers of the nanotubes and 2D COF. The nanotube and analogous 2D COF exhibit longer excited-state lifetimes (~100 ps) compared to the individual, solvated macrocycles (<0.5 ps). These differences are attributed to the internal conversion facilitated by the internal motions of the imine linkages which are significantly reduced in the assembled macrocycles in the nanotube and 2D COF sheets in the layered structures. The exciton diffusion processes in the assembled nanotubes and 2D COF systems were characterized by the autocorrelations of the transition dipole moment of the excitons, giving the depolarization timemore » constants for both systems to be ~1 ps. This work also reveals the anisotropic exciton dynamics related to the in-plane and inter-plane structural factors in these systems. These studies provide guidance for the design of future COF materials, where the longer excited state lifetimes imparted by assembly are beneficial for optoelectronic applications.« less

Authors:
 [1]; ORCiD logo [1];  [2]; ORCiD logo [3]; ORCiD logo [2]; ORCiD logo [2]; ORCiD logo [2];  [2];  [2];  [2];  [2]; ORCiD logo [2];  [1]; ORCiD logo [2]; ORCiD logo [1]
+ Show Author Affiliations
  1. Northwestern Univ., Evanston, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  2. Northwestern Univ., Evanston, IL (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE Office of Science Graduate Student Research (SCGSR) Program; US Army Research Office (ARO); Northwestern University; National Science Foundation (NSF); USDOE
OSTI Identifier:
1879878
Alternate Identifier(s):
OSTI ID: 1842356
Grant/Contract Number:  
AC02-06CH11357; DE-SC0014664; W911NF-15-1-0447; NSF ECCS-1542205; NSF DMR-1720139; DGE-1842165
Resource Type:
Accepted Manuscript
Journal Name:
Journal of Materials Chemistry C
Additional Journal Information:
Journal Volume: 10; Journal Issue: 8; Journal ID: ISSN 2050-7526
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Helweh, Waleed, Flanders, Nathan C., Wang, Shiwei, Phelan, Brian T., Kim, Pyosang, Strauss, Michael J., Li, Rebecca L., Kelley, Matthew S., Kirschner, Matthew S., Edwards, Dillon O., Spencer, Austin P., Schatz, George C., Schaller, Richard D., Dichtel, William R., and Chen, Lin X. Layered structures of assembled imine-linked macrocycles and two-dimensional covalent organic frameworks give rise to prolonged exciton lifetimes. United States: N. p., 2022. Web. doi:10.1039/d1tc05840a.
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Helweh, Waleed, Flanders, Nathan C., Wang, Shiwei, Phelan, Brian T., Kim, Pyosang, Strauss, Michael J., Li, Rebecca L., Kelley, Matthew S., Kirschner, Matthew S., Edwards, Dillon O., Spencer, Austin P., Schatz, George C., Schaller, Richard D., Dichtel, William R., & Chen, Lin X. Layered structures of assembled imine-linked macrocycles and two-dimensional covalent organic frameworks give rise to prolonged exciton lifetimes. United States. https://doi.org/10.1039/d1tc05840a
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Helweh, Waleed, Flanders, Nathan C., Wang, Shiwei, Phelan, Brian T., Kim, Pyosang, Strauss, Michael J., Li, Rebecca L., Kelley, Matthew S., Kirschner, Matthew S., Edwards, Dillon O., Spencer, Austin P., Schatz, George C., Schaller, Richard D., Dichtel, William R., and Chen, Lin X. Wed . "Layered structures of assembled imine-linked macrocycles and two-dimensional covalent organic frameworks give rise to prolonged exciton lifetimes". United States. https://doi.org/10.1039/d1tc05840a. https://www.osti.gov/servlets/purl/1879878.
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@article{osti_1879878,
title = {Layered structures of assembled imine-linked macrocycles and two-dimensional covalent organic frameworks give rise to prolonged exciton lifetimes},
author = {Helweh, Waleed and Flanders, Nathan C. and Wang, Shiwei and Phelan, Brian T. and Kim, Pyosang and Strauss, Michael J. and Li, Rebecca L. and Kelley, Matthew S. and Kirschner, Matthew S. and Edwards, Dillon O. and Spencer, Austin P. and Schatz, George C. and Schaller, Richard D. and Dichtel, William R. and Chen, Lin X.},
abstractNote = {Ordered organic materials and assemblies have great potential to be tailored to have desirable properties for optoelectronic applications, such as long exciton lifetime and high directional exciton mobility. Framework materials, such as two-dimensional covalent organic frameworks (2D COFs), as well as their truncated macrocyclic analogues, are versatile platforms to organize functional aromatic systems into designed assemblies and robust materials. In this study we investigate the exciton dynamics in a 2D COF, its corresponding hexagonal macrocycle, and extended nanotubes comprised of stacked macrocycles. The excitonic behavior of these three systems provide an understanding of excitonic processes that occur in the plane of the covalently bonded 2D macromolecules and between layers of the nanotubes and 2D COF. The nanotube and analogous 2D COF exhibit longer excited-state lifetimes (~100 ps) compared to the individual, solvated macrocycles (<0.5 ps). These differences are attributed to the internal conversion facilitated by the internal motions of the imine linkages which are significantly reduced in the assembled macrocycles in the nanotube and 2D COF sheets in the layered structures. The exciton diffusion processes in the assembled nanotubes and 2D COF systems were characterized by the autocorrelations of the transition dipole moment of the excitons, giving the depolarization time constants for both systems to be ~1 ps. This work also reveals the anisotropic exciton dynamics related to the in-plane and inter-plane structural factors in these systems. These studies provide guidance for the design of future COF materials, where the longer excited state lifetimes imparted by assembly are beneficial for optoelectronic applications.},
doi = {10.1039/d1tc05840a},
journal = {Journal of Materials Chemistry C},
number = 8,
volume = 10,
place = {United States},
year = {Wed Jan 26 00:00:00 EST 2022},
month = {Wed Jan 26 00:00:00 EST 2022}
}
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https://doi.org/10.1039/d1tc05840a
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