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Title: Reversible Interlayer Sliding and Conductivity Changes in Adaptive Tetrathiafulvalene-Based Covalent Organic Frameworks

Journal Article · · ACS Applied Materials and Interfaces
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [5]; ORCiD logo [6];  [7];  [8]; ORCiD logo [8];  [9]; ORCiD logo [10];  [4]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [3]
  1. South China Normal Univ., Guangzhou (China); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
  2. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry; China University of Geosciences, Beijing (China)
  3. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
  4. South China Normal Univ., Guangzhou (China)
  5. Univ. de Jaén (Spain)
  6. Univ. de Castilla-La Mancha, Albacete (Spain)
  7. Univ. of California, Berkeley, CA (United States); Nanjing Forestry Univ. (China)
  8. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  9. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
  10. Univ. of California, Berkeley, CA (United States)

Ordered interlayer stacking is intrinsic in two-dimensional covalent organic frameworks (2D COFs) and has strong implications on COF's optoelectronic properties. Reversible interlayer sliding, corresponding to shearing of 2D layers along their basal plane, is an appealing dynamic control of both structures and properties, yet it remains unexplored in the 2D COF field. In this paper, we demonstrate that the reversible interlayer sliding can be realized in an imine-linked tetrathiafulvalene (TTF)-based COF TTF-DMTA. The solvent treatment induces crystalline phase changes between the proposed staircase-like sql net structure and a slightly slipped eclipsed sql net structure. The solvation-induced crystallinity changes correlate well with reversible spectroscopic and electrical conductivity changes as demonstrated in oriented COF thin films. In contrast, no reversible switching is observed in a related TTF-TA COF, which differs from TTF-DMTA in terms of the absence of methoxy groups on the phenylene linkers. This work represents the first 2D COF example of which eclipsed and staircase-like aggregated states are interchangeably accessed via interlayer sliding, an uncharted structural feature that may enable applications such as chemiresistive sensors.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). The Molecular Foundry (TMF) and Advanced Light Source (ALS)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; National Natural Science Foundation of China (NSFC); Natural Science Foundation of Guangdong Province; China Scholarship Council (CSC)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1661601
Journal Information:
ACS Applied Materials and Interfaces, Journal Name: ACS Applied Materials and Interfaces Journal Issue: 16 Vol. 12; ISSN 1944-8244
Publisher:
American Chemical Society (ACS)Copyright Statement
Country of Publication:
United States
Language:
English

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