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Alahmadi AF, Yin X, Lalancette RA, Jäkle F. Synthesis and Structure-Property Relationships in Regioisomeric Alternating Borane-Terthiophene Polymers. Chemistry 2022; 29:e202203619. [PMID: 36562302 DOI: 10.1002/chem.202203619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2022] [Revised: 12/17/2022] [Accepted: 12/18/2022] [Indexed: 12/24/2022]
Abstract
Main-chain boron-containing π-conjugated polymers are attractive for organic electronic, sensing, and imaging applications. Alternating terthiophene-borane polymers were prepared and the effects of regioisomeric attachment of the conjugated linker and variations in the electronic effect of the pendent aryl groups (2,4,6-tri-tert-butylphenyl, Mes*; 2,4,6-tris(trifluoromethyl)phenyl, FMes) examined. Pd2 dba3 /P(t-Bu)3 -catalyzed Stille polymerization of arylbis(2-thienyl)borane and arylbis(3-thienylborane) with 2,5-bis(trimethylstannyl)thiophene at 120 °C gave polymers with appreciable molecular weight but MALDI-TOF MS analyses showed evidence of unusually prominent homocoupling. These defects could be suppressed by using brominated rather than iodinated monomers, more hindered 2,5-bis(tri-n-butylstannyl)thiophene as comonomer, and Pd2 dba3 /P(o-tol)3 as the catalyst at 100 °C. Under these conditions, macrocyclic species with n=3-10 repeating units formed preferentially according to MALDI-TOF MS analyses. Photophysical studies revealed a prominent effect of the regiochemistry and the nature of the pendent aryl groups on the absorption and emission, giving rise to orange, yellow-green, blue-green, and blue emissive materials respectively. The electronic effects were rationalized through DFT calculations on bis(terthiophene) model systems.
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Affiliation(s)
- Abdullah F Alahmadi
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, 07102, Newark, NJ, USA
| | - Xiaodong Yin
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, 07102, Newark, NJ, USA.,Current address: Key Laboratory of Cluster Science, Ministry of Education of China, Beijing Key Laboratory of Photoelectronic/, Electrophotonic Conversion Materials, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, 102488, Beijing, P. R. China
| | - Roger A Lalancette
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, 07102, Newark, NJ, USA
| | - Frieder Jäkle
- Department of Chemistry, Rutgers University-Newark, 73 Warren Street, 07102, Newark, NJ, USA
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2
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Ye S, Lotocki V, Xu H, Seferos DS. Group 16 conjugated polymers based on furan, thiophene, selenophene, and tellurophene. Chem Soc Rev 2022; 51:6442-6474. [PMID: 35843215 DOI: 10.1039/d2cs00139j] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Five-membered aromatic rings containing Group 16 elements (O, S, Se, and Te), also referred as chalcogenophenes, are ubiquitous building blocks for π-conjugated polymers (CPs). Among these, polythiophenes have been established as a model system to study the interplay between molecular structure, solid-state organization, and electronic performance. The judicious substitution of alternative heteroatoms into polythiophenes is a promising strategy for tuning their properties and improving the performance of derived organic electronic devices, thus leading to the recent abundance of CPs containing furan, selenophene, and tellurophene. In this review, we first discuss the current status of Kumada, Negishi, Murahashi, Suzuki-Miyaura, and direct arylation polymerizations, representing the best routes to access well-defined chalcogenophene-containing homopolymers and copolymers. The self-assembly, optical, solid-state, and electronic properties of these polymers and their influence on device performance are then summarized. In addition, we highlight post-polymerization modifications as effective methods to transform polychalcogenophene backbones or side chains in ways that are unobtainable by direct polymerization. Finally, the major challenges and future outlook in this field are presented.
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Affiliation(s)
- Shuyang Ye
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada.
| | - Victor Lotocki
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada.
| | - Hao Xu
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada.
| | - Dwight S Seferos
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada. .,Department of Chemical Engineering and Applied Chemistry, University of Toronto, 200 College Street, Toronto, Ontario M5S 3E5, Canada
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Grandl M, Schepper J, Maity S, Peukert A, von Hauff E, Pammer F. N → B Ladder Polymers Prepared by Postfunctionalization: Tuning of Electron Affinity and Evaluation as Acceptors in All-Polymer Solar Cells. Macromolecules 2019. [DOI: 10.1021/acs.macromol.8b02595] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Markus Grandl
- Wacker Chemie
AG, Johannes-Hess-Strasse 24, 84489 Burghausen, Germany
| | - Jonas Schepper
- Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, D-89081 Ulm, Germany
| | - Sudeshna Maity
- Department of Physics and Astronomy, Vrije Universiteit Amsterdam, De Boelelaan 1081, NL-1081 HV Amsterdam, Netherlands
| | - Andreas Peukert
- Department of Physics and Astronomy, Vrije Universiteit Amsterdam, De Boelelaan 1081, NL-1081 HV Amsterdam, Netherlands
| | - Elizabeth von Hauff
- Department of Physics and Astronomy, Vrije Universiteit Amsterdam, De Boelelaan 1081, NL-1081 HV Amsterdam, Netherlands
| | - Frank Pammer
- Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, D-89081 Ulm, Germany
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Jin YJ, Araki D, Teraguchi M, Aoki T, Kwak G. Dimesitylboryl-containing polydiphenylacetylene with a large Stokes shift, high fluorescence efficiency, and fluoride ion sensing ability. POLYMER 2018. [DOI: 10.1016/j.polymer.2018.06.044] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Lik A, Jenthra S, Fritze L, Müller L, Truong KN, Helten H. From Monodisperse Thienyl- and Furylborane Oligomers to Polymers: Modulating the Optical Properties through the Hetarene Ratio. Chemistry 2018. [PMID: 29543358 DOI: 10.1002/chem.201706124] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The application of our newly developed B-C coupling method by catalytic Si/B exchange is demonstrated for the synthesis of a series of triarylboranes (1), monodisperse thienyl- and furylborane dimers (2) and trimers (9), extended oligomers (3) and polymers (3'), as well as mixed (oligo)thienyl-/furylboranes. The structures of 1 aaTip , 1 bbTip , and 2 bbbMes* , determined by X-ray crystallography, reveal largely coplanar hetarene rings and BR3 environments, which are most pronounced in the furylborane species. Photophysical investigations, supported by TD-DFT calculations, revealed pronounced π-electron delocalization over the hetarene backbones including the boron centers. With an extended series of derivatives of varying chain lengths available, we were able to determine the effective conjugation lengths (ECL) of poly(thienylborane)s and poly(furylborane)s, which have been reached with the highest-molecular-weight derivatives of our study. Through variation of the furan-to-thiophene ratio, the photophysical properties of these materials are effectively modulated. Significantly, higher furan contents lead to considerably increased fluorescence intensities. Compounds 1 aaTip , 1 bbTip , and 3 aTip showed the ability to bind fluoride anions. The binding process is signaled by a distinct change in their optical absorption characteristics, thus rendering these materials attractive targets for sensory applications.
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Affiliation(s)
- Artur Lik
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056, Aachen, Germany
| | - Sangeth Jenthra
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056, Aachen, Germany
| | - Lars Fritze
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056, Aachen, Germany
| | - Lars Müller
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056, Aachen, Germany
| | - Khai-Nghi Truong
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056, Aachen, Germany
| | - Holger Helten
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056, Aachen, Germany
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6
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Jäger J, Schraff S, Pammer F. Synthesis, Properties, and Solar Cell Performance of Poly(4-(p
-alkoxystyryl)thiazole)s. MACROMOL CHEM PHYS 2018. [DOI: 10.1002/macp.201700496] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jakob Jäger
- Institute of Organic Chemistry II and Advanced Materials; University of Ulm; Albert-Einstein-Allee 11 89081 Ulm Germany
| | - Sandra Schraff
- Institute of Organic Chemistry II and Advanced Materials; University of Ulm; Albert-Einstein-Allee 11 89081 Ulm Germany
| | - Frank Pammer
- Institute of Organic Chemistry II and Advanced Materials; University of Ulm; Albert-Einstein-Allee 11 89081 Ulm Germany
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Dou C, Liu J, Wang L. Conjugated polymers containing B←N unit as electron acceptors for all-polymer solar cells. Sci China Chem 2017. [DOI: 10.1007/s11426-016-0503-x] [Citation(s) in RCA: 110] [Impact Index Per Article: 15.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Leone AK, McNeil AJ. Matchmaking in Catalyst-Transfer Polycondensation: Optimizing Catalysts based on Mechanistic Insight. Acc Chem Res 2016; 49:2822-2831. [PMID: 27936580 DOI: 10.1021/acs.accounts.6b00488] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Catalyst-transfer polycondensation (CTP) has emerged as a useful living, chain-growth polymerization method for synthesizing conjugated (hetero)arene-based polymers with targetable molecular weights, narrow dispersities, and controllable copolymer sequences-all properties that significantly influence their performance in devices. Over the past decade, several phosphine- and carbene-ligated Ni- and Pd-based precatalysts have been shown to be effective in CTP. One current limitation is that these traditional CTP catalysts lead to nonliving, non-chain-growth behavior when complex monomer scaffolds are utilized. Because these monomers are often found in the highest-performing materials, there is a significant need to identify alternative CTP catalysts. Recent mechanistic insight into CTP has laid the foundation for designing new catalysts to expand the CTP monomer scope. Building off this insight, we have designed and implemented model systems to identify effective catalysts by understanding their underlying mechanistic behaviors and systematically modifying catalyst structures to improve their chain-growth behavior. In this Account, we describe how each catalyst parameter-the ancillary ligand(s), reactive ligand(s), and transition metal-influences CTP. As an example, ancillary ligands often dictate the turnover-limiting step of the catalytic cycle, and perhaps more importantly, they can be used to promote the formation of the key intermediate (a metal-arene associative complex) and its subsequent reactivity. The fidelity of this intermediate is central to the mechanism for the living, chain-growth polymerization. Reactive ligands, on the other hand, can be used to improve catalyst solubility and accelerate initiation. Additional advantages of the reactive ligand include providing access points for postpolymerization modification and synthesizing polymers directly off surfaces. While the most frequently used CTP catalysts contain nickel, palladium-based catalysts exhibit a higher functional group tolerance and broader substrate scope (e.g., monomers with boron, magnesium, tin, and gold transmetalating agents). Overall, we anticipate that applying the tools and lessons detailed in this Account to other monomers should facilitate a better "matchmaking" process that will lead to new catalyst-transfer polycondensations.
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Affiliation(s)
- Amanda K. Leone
- Department of Chemistry and
Macromolecular Science and Engineering Program, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States
| | - Anne J. McNeil
- Department of Chemistry and
Macromolecular Science and Engineering Program, University of Michigan, 930 North University Avenue, Ann Arbor, Michigan 48109-1055, United States
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Grandl M, Kaese T, Krautsieder A, Sun Y, Pammer F. Hydroboration as an Efficient Tool for the Preparation of Electronically and Structurally Diverse N→B-Heterocycles. Chemistry 2016; 22:14373-82. [DOI: 10.1002/chem.201602458] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2016] [Indexed: 01/29/2023]
Affiliation(s)
- Markus Grandl
- Institute of Organic Chemistry II and Advanced Materials; University of Ulm, Albert-Einstein-Allee 11; 89081 Ulm Germany
| | - Thomas Kaese
- Institut für Anorganische und Analytische Chemie; Goethe-Universität Frankfurt; Max-von-Laue-Strasse 7 30438 Frankfurt am Main Germany
| | - Anke Krautsieder
- Institute of Organic Chemistry II and Advanced Materials; University of Ulm, Albert-Einstein-Allee 11; 89081 Ulm Germany
| | - Yu Sun
- Fachbereich Chemie; Technische Universität Kaiserslautern; Erwin-Schrödinger-Strasse 54 67663 Kaiserslautern Germany
| | - Frank Pammer
- Institute of Organic Chemistry II and Advanced Materials; University of Ulm, Albert-Einstein-Allee 11; 89081 Ulm Germany
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Wang XY, Zhuang FD, Wang JY, Pei J. Incorporation of polycyclic azaborine compounds into polythiophene-type conjugated polymers for organic field-effect transistors. Chem Commun (Camb) 2016; 51:17532-5. [PMID: 26452002 DOI: 10.1039/c5cc06927k] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A thiophene-fused polycyclic azaborine skeleton was employed into conjugated polymers for organic field-effect transistors for the first time. Two polythiophene-type polymers were developed, which exhibited low HOMO levels and strong intermolecular interactions, leading to a hole mobility of up to 0.38 cm(2) V(-1) s(-1).
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Affiliation(s)
- Xiao-Ye Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
| | - Fang-Dong Zhuang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
| | - Jie-Yu Wang
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
| | - Jian Pei
- Beijing National Laboratory for Molecular Sciences, Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, Center for Soft Matter Science and Engineering, College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.
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11
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Grandl M, Sun Y, Pammer F. Generation of an N→B Ladder-type Structure by Regioselective Hydroboration of an Alkenyl-Functionalized Quaterpyridine. Chemistry 2016; 22:3976-80. [DOI: 10.1002/chem.201600228] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2016] [Indexed: 11/05/2022]
Affiliation(s)
- Markus Grandl
- Institute of Organic Chemistry II and Advanced Materials; University of Ulm; Albert-Einstein-Allee 11 89081 Ulm Germany
| | - Yu Sun
- Fachbereich Chemie; Technische Universität Kaiserslautern; Erwin-Schrödinger-Strasse 54 67663 Kaiserslautern Germany
| | - Frank Pammer
- Institute of Organic Chemistry II and Advanced Materials; University of Ulm; Albert-Einstein-Allee 11 89081 Ulm Germany
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12
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Yin X, Guo F, Lalancette RA, Jäkle F. Luminescent Main-Chain Organoborane Polymers: Highly Robust, Electron-Deficient Poly(oligothiophene borane)s via Stille Coupling Polymerization. Macromolecules 2016. [DOI: 10.1021/acs.macromol.5b02446] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Xiaodong Yin
- Department of Chemistry, Rutgers University Newark, 73
Warren Street, Newark, New
Jersey 07102, United States
| | - Fang Guo
- Department of Chemistry, Rutgers University Newark, 73
Warren Street, Newark, New
Jersey 07102, United States
| | - Roger A. Lalancette
- Department of Chemistry, Rutgers University Newark, 73
Warren Street, Newark, New
Jersey 07102, United States
| | - Frieder Jäkle
- Department of Chemistry, Rutgers University Newark, 73
Warren Street, Newark, New
Jersey 07102, United States
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13
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Ren Y, Jäkle F. Merging thiophene with boron: new building blocks for conjugated materials. Dalton Trans 2016; 45:13996-4007. [DOI: 10.1039/c6dt02756c] [Citation(s) in RCA: 174] [Impact Index Per Article: 21.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Recent advances on the use of thienylborane chemistry for the development of new functional materials are highlighted.
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Affiliation(s)
- Yi Ren
- Department of Chemistry
- Rutgers University–Newark
- Newark
- USA
| | - Frieder Jäkle
- Department of Chemistry
- Rutgers University–Newark
- Newark
- USA
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14
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Grandl M, Pammer F. Preparation of Head-to-Tail Regioregular 6-(1-Alkenyl)-Functionalized Poly(pyridine-2,5-diyl) and its Post-Functionalization via Hydroboration. MACROMOL CHEM PHYS 2015. [DOI: 10.1002/macp.201500337] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Markus Grandl
- Institute of Organic Chemistry II and Advanced Materials; University of Ulm; 89081 Ulm Germany
| | - Frank Pammer
- Institute of Organic Chemistry II and Advanced Materials; University of Ulm; 89081 Ulm Germany
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15
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Adams IA, Rupar PA. A Poly(9-Borafluorene) Homopolymer: An Electron-Deficient Polyfluorene with “Turn-On” Fluorescence Sensing of NH3
Vapor. Macromol Rapid Commun 2015; 36:1336-40. [DOI: 10.1002/marc.201500107] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Revised: 04/03/2015] [Indexed: 11/10/2022]
Affiliation(s)
- Ian A. Adams
- Department of Chemistry; The University of Alabama; Tuscaloosa AL 35487-0036 USA
| | - Paul A. Rupar
- Department of Chemistry; The University of Alabama; Tuscaloosa AL 35487-0036 USA
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Guo F, Yin X, Pammer F, Cheng F, Fernandez D, Lalancette RA, Jäkle F. Regioregular Organoborane-Functionalized Poly(3-alkynylthiophene)s. Macromolecules 2014. [DOI: 10.1021/ma501969q] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- F. Guo
- Department
of Chemistry, Rutgers University−Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - X. Yin
- Department
of Chemistry, Rutgers University−Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - F. Pammer
- Department
of Chemistry, Rutgers University−Newark, 73 Warren Street, Newark, New Jersey 07102, United States
- Institut
für Organische Chemie II und Neue Materialien, Universität Ulm, Albert Einstein Allee 11, 89081 Ulm, Germany
| | - F. Cheng
- Department
of Chemistry, Rutgers University−Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - D. Fernandez
- Department
of Chemistry, Rutgers University−Newark, 73 Warren Street, Newark, New Jersey 07102, United States
| | - R. A. Lalancette
- Department
of Chemistry, Rutgers University−Newark, 73 Warren Street, Newark, New Jersey 07102, United States
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Hu Y, Zhao Z, Bai X, Yuan X, Zhang X, Masuda T. Organoborane-containing polyacetylene derivatives: synthesis, characterization, and fluoride-sensing properties. RSC Adv 2014. [DOI: 10.1039/c4ra11062e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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19
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Pammer F, Jäger J, Rudolf B, Sun Y. Soluble Head-to-Tail Regioregular Polythiazoles: Preparation, Properties, and Evidence for Chain-Growth Behavior in the Synthesis via Kumada-Coupling Polycondensation. Macromolecules 2014. [DOI: 10.1021/ma501213g] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Frank Pammer
- Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, D-89081 Ulm, Germany
| | - Jakob Jäger
- Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, D-89081 Ulm, Germany
| | - Benjamin Rudolf
- Institute of Organic Chemistry II and Advanced Materials, University of Ulm, Albert-Einstein-Allee 11, D-89081 Ulm, Germany
| | - Yu Sun
- Fachbereich Chemie, TU Kaiserslautern, Erwin-Schrödinger-Strasse 54, D-67663 Kaiserslautern, Germany
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