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Title: Förster Energy Transport in Metal–Organic Frameworks Is Beyond Step-by-Step Hopping

Journal Article · · Journal of the American Chemical Society
DOI:https://doi.org/10.1021/jacs.6b01345· OSTI ID:1247615
 [1];  [1];  [1];  [1];  [1];  [2];  [1];  [1];  [1];  [3]
  1. Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China
  2. Department of Chemistry, University of Chicago, 929 E 57th Street, Chicago, Illinois 60637, United States
  3. Collaborative Innovation Center of Chemistry for Energy Materials, State Key Laboratory of Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, PR China, Department of Chemistry, University of Chicago, 929 E 57th Street, Chicago, Illinois 60637, United States

Metal–organic frameworks (MOFs) with light-harvesting building blocks designed to mimic photosynthetic chromophore arrays in green plants provide an excellent platform to study exciton transport in networks with well-defined structures. A step-by-step exciton random hopping model made of the elementary steps of energy transfer between only the nearest neighbors is usually used to describe the transport dynamics. Although such a nearest neighbor approximation is valid in describing the energy transfer of triplet states via the Dexter mechanism, we found it inadequate in evaluating singlet exciton migration that occurs through the Förster mechanism, which involves one-step jumping over longer distance. We measured migration rates of singlet excitons on two MOFs constructed from truxene-derived ligands and zinc nodes, by monitoring energy transfer from the MOF skeleton to a coumarin probe in the MOF cavity. The diffusivities of the excitons on the frameworks were determined to be 1.8 × 10–2 cm2/s and 2.3 × 10–2 cm2/s, corresponding to migration distances of 43 and 48 nm within their lifetimes, respectively. “Through space” energy-jumping beyond nearest neighbor accounts for up to 67% of the energy transfer rates. This finding presents a new perspective in the design and understanding of highly efficient energy transport networks for singlet excited states.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Organization:
National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division
Grant/Contract Number:
21471126; NSF/CHE-1346572; AC02-06CH11357
OSTI ID:
1247615
Alternate ID(s):
OSTI ID: 1337702
Journal Information:
Journal of the American Chemical Society, Journal Name: Journal of the American Chemical Society Vol. 138 Journal Issue: 16; ISSN 0002-7863
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 109 works
Citation information provided by
Web of Science

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