Evidence map›Paper›PMID 36345828›Full record

ArticleAngewandte Chemie (International ed. in English)2023

Circularly Polarized Light Probes Excited-State Delocalization in Rectangular Ladder-type Pentaphenyl Helices.

Robin Ammenhäuser, Patrick Klein, Eva Schmid, Sabrina Streicher, Jan Vogelsang, Christian W Lehmann, John M Lupton, Stefan C J Meskers, Ullrich Scherf

Abstract read
PubMed Full text at PMC Publisher
In one paragraph

Article in Angewandte Chemie (International ed. in English), 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.

0numbers the graph read from it
0cells of the map it votes in
1citing papers in PubMed
–field-weighted citation impact
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

1 citing paper in PubMed.

  1. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

9 authors.

Robin AmmenhäuserDepartment of Chemistry, Macromolecular Chemistry group (BUWmakro), and Wuppertal Institute for Smart Materials and Systems (CM@S), Bergische Universität Wuppertal, Gauss-Str. 20, 42119, Wuppertal, Germany.
Patrick KleinDepartment of Chemistry, Macromolecular Chemistry group (BUWmakro), and Wuppertal Institute for Smart Materials and Systems (CM@S), Bergische Universität Wuppertal, Gauss-Str. 20, 42119, Wuppertal, Germany.
Eva SchmidInstitut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany.
Sabrina StreicherInstitut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany.
Jan VogelsangInstitut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany.
Christian W LehmannMax-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470, Mülheim an der Ruhr, Germany.
John M LuptonInstitut für Experimentelle und Angewandte Physik, Universität Regensburg, Universitätsstrasse 31, 93053, Regensburg, Germany.ORCID 0000-0002-7899-7598
Stefan C J MeskersMolecular Materials and Nanosystems and Institute of Complex Molecular Systems, Technische Universiteit Eindhoven, PO Box 513, 5600 MB, Eindhoven, The Netherlands.ORCID 0000-0001-9236-591X
Ullrich ScherfDepartment of Chemistry, Macromolecular Chemistry group (BUWmakro), and Wuppertal Institute for Smart Materials and Systems (CM@S), Bergische Universität Wuppertal, Gauss-Str. 20, 42119, Wuppertal, Germany.

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Ladder-type pentaphenyl chromophores have a rigid, planar π-system and show bright fluorescence featuring pronounced vibrational structure. Such moieties are ideal for studying interchromophoric interactions and delocalization of electronic excitations. We report the synthesis of helical polymers with a rigid square structure based on spiro-linked ladder-type pentaphenyl units. The variation of circular dichroism with increasing chain length provides direct evidence for delocalization of electronic excitations over at least 10 monomeric units. The change in the degree of circular polarization of the fluorescence across the vibronic side bands shows that vibrational motion can localize the excitation dynamically to almost one single unit through breakdown of the Born-Oppenheimer approximation. The dynamic conversion between delocalized and localized excited states provides a new paradigm for interpreting circular dichroism in helical polymers such as proteins and polynucleic acids.

Indexed as

PolymersVibrationCircular DichroismPolymersChiralityCircular DichroismCircular Polarization of LuminescenceHelical Ladder PolymersSpiro Bisfluorene Linkers

Identifiers

PMID36345828
PMCPMC10107742

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.