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Conjugated Copolymers
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Conjugated Copolymers

A special issue of Molecules (ISSN 1420-3049). This special issue belongs to the section "Macromolecular Chemistry".

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 6696

Special Issue Editor

Prof. Dr. Martin Baumgarten

E-Mail Website
Guest Editor
Max Planck Institute for Polymer Research, Mainz, Germany
Interests: conjugated polymers; conjugation in organics; heteroacenes; organic semiconductors; spin in organics; stable radicals; ambipolar polymers
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue of Molecules is dedicated to the synthesis and characterization of conjugated polymers and copolymers in their various fields of application. Conjugated or conducting polymers have gained a tremendous amount of recognition in many areas of materials research due to their photo-, electro-, and magnetic activity. For this Special Issue, we invite the submission of original research articles and reviews on any aspect of conjugated polymers.

Prof. Dr. Martin Baumgarten
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Molecules is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2700 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • polymeric (semi)conductors
  • organic electronics
  • polymeric light emitting diodes
  • polymeric field effect transistors
  • ambipolar polymers
  • polymeric photoconductors
  • polymers for organic photovoltaics
  • conjugated polymers for sensing
  • fluorescent sensors
  • processing of microstructures
  • band gap tuning
  • charge transport
  • spin bearing polymers
  • magnetic polymers
  • electrochromism

Published Papers (3 papers)

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Research

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15 pages, 3809 KiB  
Article
Copolymers Containing 1-Methyl-2-phenyl-imidazole Moieties as Permanent Dipole Generating Units: Synthesis, Spectroscopic, Electrochemical, and Photovoltaic Properties
by Irena Kulszewicz-Bajer, Robert Nowakowski, Małgorzata Zagórska, Agnieszka Maranda-Niedbała, Wojciech Mech, Zbigniew Wróbel, Jakub Drapała, Ireneusz Wielgus and Krzysztof P. Korona
Molecules 2022, 27(3), 915; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules27030915 - 28 Jan 2022
Viewed by 1683
Abstract
New donor–acceptor conjugated alternating or random copolymers containing 1-methyl-2-phenylbenzimidazole and benzothiadiazole (P1), diketopyrrolopyrrole (P4), or both acceptors (P2) are reported. The specific feature of these copolymers is the presence of a permanent dipole-bearing moiety (1-methyl-2-phenyl imidazole (MPI)) [...] Read more.
New donor–acceptor conjugated alternating or random copolymers containing 1-methyl-2-phenylbenzimidazole and benzothiadiazole (P1), diketopyrrolopyrrole (P4), or both acceptors (P2) are reported. The specific feature of these copolymers is the presence of a permanent dipole-bearing moiety (1-methyl-2-phenyl imidazole (MPI)) fused with the 1,4-phenylene ring of the polymer main chain. For comparative reasons, polymers of the same main chain but deprived of the MPI group were prepared, namely, P5 with diketopyrrolopyrrole and P3 with both acceptors. The presence of the permanent dipole results in an increase of the optical band gap from 1.51 eV in P3 to 1.57 eV in P2 and from 1.49 eV in P5 to 1.55 eV in P4. It also has a measurable effect on the ionization potential (IP) and electrochemical band gap (EgCV), leading to their decrease from 5.00 and 1.83 eV in P3 to 4.92 and 1.79 eV in P2 as well as from 5.09 and 1.87 eV in P5 to 4.94 and 1.81 eV in P4. Moreover, the presence of permanent dipole lowers the exciton binding energy (Eb) from 0.32 eV in P3 to 0.22 eV in P2 and from 0.38 eV in P5 to 0.26 eV in P4. These dipole-induced changes in the polymer properties should be beneficial for photovoltaic applications. Bulk heterojunction solar cells fabricated from these polymers (with PC71BM acceptor) show low series resistance (rs), indicating good electrical transport properties. The measured power conversion efficiency (PCE) of 0.54% is limited by the unfavorable morphology of the active layer. Full article
(This article belongs to the Special Issue Conjugated Copolymers)
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Review

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23 pages, 5224 KiB  
Review
Conjugated Molecules and Polymers in Secondary Batteries: A Perspective
by Rudolf Holze
Molecules 2022, 27(2), 546; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules27020546 - 15 Jan 2022
Cited by 13 | Viewed by 2332
Abstract
Intrinsically conducting polymers constituting a subclass of macromolecules, as well as a still growing family of large, conjugated molecules, oligomers, and polymers, have attracted research interest for the recent decades. Closely corresponding to the fascination of these materials, combining typical properties of organic [...] Read more.
Intrinsically conducting polymers constituting a subclass of macromolecules, as well as a still growing family of large, conjugated molecules, oligomers, and polymers, have attracted research interest for the recent decades. Closely corresponding to the fascination of these materials, combining typical properties of organic polymers and metallic materials, numerous applications have been suggested, explored, and sometimes transferred into products. In electrochemistry, they have been used in various functions beyond the initially proposed and obvious application as active masses in devices for electrochemical energy conversion and storage. This perspective contribution wraps up basic facts that are necessary to understand the behavior and properties of the oligo and polymers and their behavior in electrochemical cells for energy conversion by electrode reactions and associated energy storage. Representative examples are presented and discussed, and an overview of the state of research and development is provided. Particular attention is paid to stability and related aspects of practical importance. Future trends and perspectives are indicated. Full article
(This article belongs to the Special Issue Conjugated Copolymers)
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12 pages, 3795 KiB  
Review
Intrinsically Elastic Organic Semiconductors (IEOSs)
by Fei Liu, Xueling Hou, Benlin Hu and Runwei Li
Molecules 2021, 26(20), 6130; https://0-doi-org.brum.beds.ac.uk/10.3390/molecules26206130 - 11 Oct 2021
Cited by 3 | Viewed by 2058
Abstract
Elastic semiconductors are becoming more and more important to the development of flexible wearable electronic devices, which can be prepared by structural engineering design, blending, and the intrinsic elastification of organic semiconductors (intrinsically elastic organic semiconductor, IEOS). Compared with the elastic semiconductors prepared [...] Read more.
Elastic semiconductors are becoming more and more important to the development of flexible wearable electronic devices, which can be prepared by structural engineering design, blending, and the intrinsic elastification of organic semiconductors (intrinsically elastic organic semiconductor, IEOS). Compared with the elastic semiconductors prepared by structural engineering and blending, the IEOS prepared by organic synthesis has attracted numerous attentions for its solution processability and highly tunable chemical structures. For IEOSs, reasonable designs of synthetic routes and methods are the basis for realizing good mechanical and electrical properties. This brief review begins with a concise introduction of elastic semiconductors, then follows with several synthetic methods of IEOSs, and concludes the characteristics of each method, which provides guidance for the synthesis of IEOSs in the future. Furthermore, the properties of IEOSs are involved from the aspects of electrical, mechanical properties, and the applications of the IEOSs in elastic electronic devices. Finally, the challenge and an outlook which IEOSs are facing are presented in conclusion. Full article
(This article belongs to the Special Issue Conjugated Copolymers)
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