Semiconducting Supramolecular Organic Frameworks Assembled from a Near-Infrared Fluorescent Macrocyclic Probe and Fullerenes

Ramandeep Kaur, Sajal Sen, Mads Christian Larsen, Luciana Tavares, Jakob Kjelstrup-Hansen, Masatoshi Ishida, Anna Zieleniewska, Vincent M Lynch, Steffen Bähring, Dirk M Guldi, Jonathan L Sessler*, Atanu Jana*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We report here a new extended tetrathiafulvalene (exTTF)-porphyrin scaffold, 2, that acts as a ball-and-socket receptor for C 60 and C 70. Supramolecular interactions between 2 and these fullerenes serve to stabilize 3D supramolecular organic frameworks (SOFs) in the solid state formally comprising peapod-like linear assemblies. The SOFs prepared via self-assembly in this way act as "tunable functional materials", wherein the complementary geometry of the components and the choice of fullerene play crucial roles in defining the conductance properties. The highest electrical conductivity (σ = 1.3 × 10 -8 S cm -1 at 298 K) was observed in the case of the C 70-based SOF. In contrast, low conductivity was seen for the SOF based on pristine 2 (σ = 5.9 × 10 -11 S cm -1 at 298 K). The conductivity seen for the C 70-based SOF approaches that seen for other TTF- and fullerene-based supramolecular materials despite the fact that the present systems are metal-free and constructed entirely from neutral building blocks. Transient absorption spectroscopic measurements corroborated the formation of charge-transfer states (i.e., 2 δ+/C 60 δ- and 2 δ+/C 70 δ-, respectively) rather than fully charge separated states (i.e., 2 •+/C 60 •- and 2 •+/C 70 •-, respectively) both in solution (toluene and benzonitrile) and in the solid state at 298 K. Such findings are considered consistent with an ability to transfer charges effectively over long distances within the present SOFs, rather than, for example, the formation of energetically trapped ionic species.

Original languageEnglish
JournalJournal of the American Chemical Society
Volume142
Issue number26
Pages (from-to)11497-11505
ISSN0002-7863
DOIs
Publication statusPublished - 1. Jul 2020

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