Transition-metal-free controlled polymerization for poly(p-aryleneethynylene)s

Sanji, Takanobu; Motoshige, Asahi; Komiyama, Hideaki; Kakinuma, Junko; Ushikubo, Rie; Watanabe, Satoru; Iyoda, Tomokazu

doi:10.1039/c4sc02872d

Cited by 22 publications

(24 citation statements)

References 36 publications

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“…The vibrational mode of C≡C at 2002 cm –1 was downshifted from 2157 cm –1 in bulk MPETMS (Figure S10), indicating the formation of covalent Au–C σ‐bonds. Note that the binding motif of terminal alkynes on Au surfaces has been documented ,. In addition, SERS spectroscopy was also performed using an excitation wavelength of 785 nm (Figure b).…”

Section: Resultsmentioning

confidence: 99%

“…Note that the binding motif of terminal alkynes on Au surfaces has been documented. [45,46] In addition, SERS spectroscopy was also performed using an excitation wavelength of 785 nm (Figure 4b). The peaks of n(C-CH 3 /d CH), n(C=C), and n(C C, Au bound) were found at 1166, 1595, and 1995 cm -1 , respectively, in the same fashion as with the excitation wavelength of 532 nm.…”

Section: Sers Study On Au Nanorod Arraymentioning

confidence: 99%

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Fabrication of a Vertically Aligned Au Nanorod Array via Block‐Copolymer‐Templated Electroplating

Komiyama

2018

ChemistrySelect

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Hexagonally assembled gold (Au) nanorod arrays oriented perpendicular to the substrate are fabricated by block‐copolymer‐templated electroplating. An amphiphilic diblock copolymer consisting of poly(ethylene oxide) (PEO) and poly(methacrylate) bearing an azobenzene mesogen on the side chain (PEO‐b‐PMA(Az)) thin film is used as a template without any nanopore‐generation processes. The PEO within the microphase‐separated cylindrical domains of the template function as an electrolytic medium to electroplate Au. The Au nanorods selectively grow through the PEO cylindrical domains. The growth process of the Au nanorods is monitored using cyclic voltammetry and field emission scanning electron microscopy. The feature size (diameter, periodicity, and length) of the Au nanorods is controlled by the feature size and thickness of the template and the amount of passed charge. The optical characteristics of the resulting Au nanorod array are carefully investigated, including angle‐dependent ultraviolet–visible–near infrared spectra and surface enhanced Raman scattering activity. In addition, the morphology of Au nanorods in the template change into Au nanoparticles based on Rayleigh instability.

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Section: Resultsmentioning

confidence: 99%

Section: Sers Study On Au Nanorod Arraymentioning

confidence: 99%

Fabrication of a Vertically Aligned Au Nanorod Array via Block‐Copolymer‐Templated Electroplating

Komiyama

2018

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“…Only very recently, π-conjugated copolymers based on perfluoroaromatics and thiophene or alkynes moieties have been successfully synthesized in absence of any transition metals. [223,224] The polymerization relies on the fluoride-catalyzed activation of Si-C bonds on one hand and on nucleophilic aromatic substitutions on the other hand.…”

Section: Concluding Remarks and Future Challengesmentioning

confidence: 99%

Update and challenges in organo-mediated polymerization reactions

Ottou

Sardón

Mecerreyes

et al. 2016

Progress in Polymer Science

311

223

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International audienceOrganocatalysis has become a very powerful tool for precision macromolecular chemistry, as judged by the number of articles published in this field in the past decade. A variety of small organic molecules, including Bronsted/Lewis bases and acids, based on amines, phosphines or carbenes, but also on bi-component systems, have been employed as a means to catalyze the polymerization of miscellaneous monomers. Not only can organocatalysts be employed to promote the ring-opening polymerization of various heterocyclics (e.g. lactones, lactide, cyclic carbonates, epoxides, lactams, cyclocarbosiloxanes), but some of them also allow activating vinylic monomers such as (meth)acrylics, or triggering the step growth polymerization of monomers such as diisocyanates and diols for polyurethane synthesis. The reduced toxicity of organocatalysts in comparison to their metallic counterparts is also driving their development in some sensitive applications, such as biomedical or microelectronics. Overall, organocatalysts display specific monomer activation modes, thereby providing a unique opportunity to control the polymerization of various functional monomers, under mild conditions. This review article focuses on advances of the past 4 years (>150 publications) in polymerization reactions utilizing small organic molecules either as direct initiators or as true catalysts, with a special emphasis on monomer activation modes, as well as polymerization mechanism aspects

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“…This approach has been introduced by Sanji et al for the synthesis of P(PPalt-T) 148 and P(PP-alt-PE). 149 Scheme 11: Alternating conjugated copolymers prepared via chain-growth polymerization.…”

Section: Conjugated Alternating Copolymersmentioning

confidence: 99%

Advances in the controlled polymerization of conjugated polymers

Verheyen

Leysen

Eede

et al. 2017

Polymer

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This article features recent advances in the synthesis of conjugated polymers via a controlled polymerization. These polymerizations typically rely on transition metal catalyzed cross coupling reactions. The mechanisms of the polymerization protocols are discussed in detail. An overview of all possible protocols and all homopolymers that have been investigated is given. Next, the synthesis of copolymers-random, gradient and block copolymers-is reviewed. Another advantage of a controlled polymerization is the possibility to introduce specific functional groups, either at the beginning of each polymer chain by the use of an external initiator, or at the end of the polymer chain using an endcapper. Finally, topologies different from simple linear polymer chains are discussed. This feature article is complementary to other recent review articles on this topic. 1,2

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Transition-metal-free controlled polymerization for poly(p-aryleneethynylene)s

Abstract: A catalytic amount of fluoride anions promoted the polymerization of 1-pentafluorophenyl-4-[(trimethylsilyl)ethynyl]benzene, providing a high-molecular-weight polymer in a chain-growth-like manner.

Cited by 22 publications

References 36 publications

Fabrication of a Vertically Aligned Au Nanorod Array via Block‐Copolymer‐Templated Electroplating

Fabrication of a Vertically Aligned Au Nanorod Array via Block‐Copolymer‐Templated Electroplating

Update and challenges in organo-mediated polymerization reactions

Advances in the controlled polymerization of conjugated polymers

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