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Volume 215, 2019
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Photocatalytically active ladder polymers

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Abstract

Conjugated ladder polymers (cLaPs) are introduced as organic semiconductors for photocatalytic hydrogen evolution from water under sacrificial conditions. Starting from a linear conjugated polymer (cLiP1), two ladder polymers are synthesized via post-polymerization annulation and oxidation techniques to generate rigidified, planarized materials bearing dibenzo[b,d]thiophene (cLaP1) and dibenzo[b,d]thiophene sulfone subunits (cLaP2). The high photocatalytic activity of cLaP1 (1307 μmol h−1 g−1) in comparison to that of cLaP2 (18 μmol h−1 g−1) under broadband illumination (λ > 295 nm) in the presence of a hole-scavenger is attributed to a higher yield of long-lived charges (μs to ms timescale), as evidenced by transient absorption spectroscopy. Additionally, cLaP1 has a larger overpotential for proton reduction and thus an increased driving force for the evolution of hydrogen under sacrificial conditions.

Graphical abstract: Photocatalytically active ladder polymers

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Article information


Submitted
21 Nov 2018
Accepted
19 Dec 2018
First published
22 Jan 2019

This article is Open Access

Faraday Discuss., 2019,215, 84-97
Article type
Paper

Photocatalytically active ladder polymers

A. Vogel, M. Forster, L. Wilbraham, Charlotte L. Smith, A. J. Cowan, M. A. Zwijnenburg, R. S. Sprick and A. I. Cooper, Faraday Discuss., 2019, 215, 84
DOI: 10.1039/C8FD00197A

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