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Photocatalytically Active Ladder Polymers

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 cLaP2 (18 μmol h−1 g−1) under broadband illumination (λ > 295 nm) in presence of a hole-scavenger is attributed to a higher yield of long-lived charges (µs–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.

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Publication details

The article was received on 21 Nov 2018, accepted on 19 Dec 2018 and first published on 22 Jan 2019


Article type: Paper
DOI: 10.1039/C8FD00197A
Citation: Faraday Discuss., 2018, Accepted Manuscript
  • Open access: Creative Commons BY license
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    Photocatalytically Active Ladder Polymers

    A. Vogel, M. Forster, L. Wilbraham, C. Smith, A. Cowan, M. Zwijnenburg, R. S. S. Sprick and A. Cooper, Faraday Discuss., 2018, Accepted Manuscript , DOI: 10.1039/C8FD00197A

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