Visible Light-Mediated Photoclick Functionalization of a Conjugated Polymer Backbone

2020 ◽  
Vol 53 (5) ◽  
pp. 1760-1766 ◽  
Author(s):  
Darryl Fong ◽  
Alice Lang ◽  
Kelvin Li ◽  
Alex Adronov
Keyword(s):  
Visible Light ◽  
Conjugated Polymer ◽  
Polymer Backbone

scholarly journals Light-Driven Depolymerization of Native Lignin Enabled by Proton- Coupled Electron Transfer

2019 ◽  
Author(s):  
Suong Nguyen ◽  
Phillip Murray ◽  
Robert Knowles
Keyword(s):  
Electron Transfer ◽  
Visible Light ◽  
Bond Cleavage ◽  
Direct Conversion ◽  
Alkoxy Radical ◽  
Radical Intermediate ◽  
Polymer Backbone ◽  
Good Efficiency ◽  
Chemical Reagents ◽  
Proton Coupled Electron Transfer

<div><p>Here we report a catalytic, light-driven method for the redox-neutral depolymerization of native lignin biomass at ambient temperature. This transformation proceeds via a proton-coupled electron-transfer (PCET) activation of an alcohol O–H bond to generate a key alkoxy radical intermediate, which then drives the <i>β</i>-scission of a vicinal C–C bond. Notably, this depolymerization is driven solely by visible light irradiation, requiring no stoichiometric chemical reagents and producing no stoichiometric waste. This method exhibits good efficiency and excellent selectivity for the activation and fragmentation of <i>β</i>-O-4 linkages in the polymer backbone, even in the presence of numerous other PCET-active functional groups. DFT analysis suggests that the key C–C bond cleavage reactions produce non-equilibrium product distributions, driven by excited-state redox events. These results provide further evidence that visible-light photocatalysis can serve as a viable method for the direct conversion of lignin biomass into valuable arene feedstocks.</p></div>

scholarly journals Photocatalyst Z-scheme system composed of a linear conjugated polymer and BiVO4 for overall water splitting under visible light

2020 ◽  
Vol 8 (32) ◽  
pp. 16283-16290 ◽  
Author(s):  
Yang Bai ◽  
Keita Nakagawa ◽  
Alexander J. Cowan ◽  
Catherine M. Aitchison ◽  
Yuichi Yamaguchi ◽  
...  
Keyword(s):  
Hydrogen Production ◽  
Metal Oxide ◽  
Visible Light ◽  
Water Splitting ◽  
Conjugated Polymer ◽  
Overall Water Splitting

A Z-scheme of a linear conjugated polymer photocatalyst and a metal oxide is able to facilitate overall water splitting without non-scalable sacrificial reagents showing potential for sustainable hydrogen production.

Efficient photocatalytic oxidation sensitized by conjugated polymers in a batch reaction and microreactors under visible light

2018 ◽  
Vol 6 (33) ◽  
pp. 15927-15932 ◽  
Author(s):  
Anqi Li ◽  
Chunyan Tan ◽  
Tianying Yuan ◽  
Jiamei Liang ◽  
Dan Gao ◽  
...  
Keyword(s):  
Visible Light ◽  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Photocatalytic Oxidation ◽  
Batch Reaction ◽  
Photosensitized Oxidation ◽  
Dual Channel

Conjugated polymer photosensitized oxidation of α-terpinene in a batch reaction and different microreactors including mono- and dual-channel, and polymer-coated dual-channel microreactors was studied.

scholarly journals Realizing high hydrogen evolution activity under visible light using narrow band gap organic photocatalysts

2021 ◽  
Author(s):  
Changzhi Han ◽  
Peihua Dong ◽  
Haoran Tang ◽  
Peiyun Zheng ◽  
Chong Zhang ◽  
...  
Keyword(s):  
Visible Light ◽  
Band Gap ◽  
Hydrogen Evolution ◽  
Visible Light Irradiation ◽  
Conjugated Polymer ◽  
Narrow Band ◽  
Light Irradiation ◽  
High Hydrogen ◽  
Photocatalytic Hydrogen Evolution ◽  
Hydrogen Evolution Rate

Narrow band gap conjugated polymer photocatalysts containing dithieno[3,2-b:2′,3′-d]thiophene-S,S-dioxide show an attractive photocatalytic hydrogen evolution rate of 16.32 mmol h−1 g−1 under visible light irradiation.

Hyperbranched Conjugated Polymer Dots: The Enhanced Photocatalytic Activity for Visible Light-Driven Hydrogen Production

2019 ◽  
Vol 52 (11) ◽  
pp. 4376-4384 ◽  
Author(s):  
Peng Zhao ◽  
Lijie Wang ◽  
Yusen Wu ◽  
Tao Yang ◽  
Yun Ding ◽  
...  
Keyword(s):  
Photocatalytic Activity ◽  
Hydrogen Production ◽  
Visible Light ◽  
Conjugated Polymer ◽  
Polymer Dots ◽  
Visible Light Driven

scholarly journals Synthesis of Low Bandgap .PI.-Conjugated Polymer Containing Thienopyrazine in the Polymer Backbone.

1998 ◽  
Vol 55 (5) ◽  
pp. 277-283
Author(s):  
Hiroshi TAMURA ◽  
Susumu YAMANAKA ◽  
Kouji MATSUDA ◽  
Toru KONISHI
Keyword(s):  
Conjugated Polymer ◽  
Polymer Backbone ◽  
Low Bandgap ◽  
Pi Conjugated

Mechanically strong, fluorescent hydrogels from zwitterionic, fully π-conjugated polymers

2014 ◽  
Vol 50 (64) ◽  
pp. 8930-8933 ◽  
Author(s):  
Einat Elmalem ◽  
Frank Biedermann ◽  
Maik R. J. Scherer ◽  
Alexandros Koutsioubas ◽  
Chris Toprakcioglu ◽  
...  
Keyword(s):  
Conjugated Polymers ◽  
Conjugated Polymer ◽  
Side Chains ◽  
Polymer Backbone

Mechanically strong supramolecular hydrogels can be obtained by combining a rigid, fully π-conjugated polymer backbone and zwitterionic side chains.

scholarly journals Helical springs as a color indicator for determining chirality and enantiomeric excess

2021 ◽  
Vol 7 (27) ◽  
pp. eabg5381
Author(s):  
Katsuhiro Maeda ◽  
Daisuke Hirose ◽  
Mai Nozaki ◽  
Yoichi Shimizu ◽  
Taro Mori ◽  
...  
Keyword(s):  
Conjugated Polymer ◽  
Enantiomeric Excess ◽  
Chiral Amines ◽  
Polymer Backbone ◽  
Helical Springs ◽  
Color Changes ◽  
Unique Color ◽  
Site Monitoring ◽  
Color Indicator

Chirality plays a key role in the physiological system, because molecular functionalities may drastically alter due to a change in chirality. We report herein a unique color indicator with a static helicity memory, which exhibits visible color changes in response to the chirality of chiral amines. A difference of less than 2% in the enantiomeric excess (ee) values causes a change in the absorption that is visible to the naked eyes. This was further quantified by digital photography by converting to RGB values. This system relies on the change in the tunable helical pitch of the π-conjugated polymer backbone in specific solvents and allows rapid on-site monitoring of chirality of nonracemic amines, including drugs, and the simultaneous quantitative determination of their ee values.

scholarly journals Corrigendum: Visible-Light-Driven Hydrogen Evolution Using Planarized Conjugated Polymer Photocatalysts

2018 ◽  
Vol 57 (10) ◽  
pp. 2520-2520 ◽  
Author(s):  
Reiner Sebastian Sprick ◽  
Baltasar Bonillo ◽  
Rob Clowes ◽  
Pierre Guiglion ◽  
Nick J. Brownbill ◽  
...  
Keyword(s):  
Visible Light ◽  
Hydrogen Evolution ◽  
Conjugated Polymer ◽  
Visible Light Driven
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