Photocatalytically active ladder polymers.
Faraday Discuss
; 215(0): 84-97, 2019 Jul 04.
Article
em En
| MEDLINE
| ID: mdl-30972395
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.
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01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2019
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Article