Tailoring COFs: transforming nonconducting 2D layered COF into a conducting quasi-3D architecture via interlayer knitting with polypyrrole

TitleTailoring COFs: transforming nonconducting 2D layered COF into a conducting quasi-3D architecture via interlayer knitting with polypyrrole
Publication TypeJournal Article
Year of Publication2023
AuthorsJain, C, Kushwaha, R, Rase, D, Shekhar, P, Shelke, A, Sonwani, D, Ajithkumar, TG, Vinod, CPrabhakara, Vaidhyanathan, R
JournalJournal of the American Chemical Society
Volume146
Issue1
Pagination487-499
Date PublishedDEC
Type of ArticleJournal Article
ISSN0002-7863
Keywordscovalent organic frameworks, Electrical conductivity
Abstract

Improving the electronic conductivity and the structural robustness of covalent organic frameworks (COFs) is paramount. Here, we covalently cross-link a 2D COF with polypyrrole (Ppy) chains to form a quasi-3D COF. The 3D COF shows well-defined reflections in the SAED patterns distinctly indexed to its modeled crystal structure. This knitting of 2D COF layers with conjugated polypyrrole units improves electronic conductivity from 10(-9) to 10(-2 )S m(-1). This conductivity boost is affirmed by the presence of density of states near the Fermi level in the 3D COF, and this elevates the COF's valence band maximum by 0.52 eV with respect to the parent 2D pyrrole-functionalized COF, which agrees well with the opto-electro band gaps. The extent of HOMO elevation suggests the predominant existence of a polaron state (radical cation), giving rise to a strong EPR signal, most likely sourced from the cross-linking polypyrrole chains. A supercapacitor devised with COF20-Ppy records a high areal capacitance of 377.6 mF cm(-2), higher than that of the COF loaded with noncovalently linked polypyrrole chains. Thus, the polypyrrole acts as a ``conjugation bridge'' across the layers, lowering the band gap and providing polarons and additional conduction pathways. This marks a far-reaching approach to converting many 2D COFs into highly ordered and conducting 3D ones.

DOI10.1021/jacs.3c09937
Type of Journal (Indian or Foreign)

Foreign

Impact Factor (IF)

15

Divison category: 
Catalysis and Inorganic Chemistry
Central NMR Facility
Database: 
Web of Science (WoS)

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