Single-Chain Janus Nanoparticle by Metallic Complexation

Abstract

Single-chain Janus nanoparticle of the example polymer polystyrene-blockpoly(2-vinylpyridine)-block-polyethylene oxide (PS-b-P2VP-b-PEO) was achieved by intramolecular crosslinking via complexation of P2VP with cobalt octacarbonyl, while the metallic complex was incorporated within the crosslinked core. It is crucial to introduce electrostatic interaction along the chain by pretreatment and thus ensure the intramolecular crosslinking in concentrated solutions, for example, 30 mg/mL. After thermolysis in the dispersion, the complex is decomposed achieving cobalt within the P2VP core. A magnetic responsive single-chain Janus composite nanoparticle was derived with the P2VP/Co core conjugated with PS and PEO single chains onto the opposite sides. The Janus composite nanoparticle displays highly catalytic activity and magnetic responsive performance from the metallic cobalt and interfacial activity from the PS and PEO single chains. A highly efficient catalytic reduction of nitroaromatic compounds at emulsion interfaces was demonstrated thereby, which was easily recycled with a magnet.

Synthetic Routes to Single Chain Polymer Nanoparticles (SCNPs): Current Status and Perspectives

“…In an interesting work by Yang and co‐workers, SCJNPs with magneto‐responsive properties were synthesized in two steps. [ 8 ] In the first step, the triblock copolymer polystyrene‐block poly(2‐vinylpyridine)‐block‐polyethylene oxide (PS‐ b ‐P2VP‐ b ‐PEO) was pre‐treated by Co 2 (CO) 8 /THF complex to form electrostatic medium ( Figure ). This pre‐treatment provided the possibility to perform the intramolecular crosslinking in high concentration (20 mg mL −1 ).…”

“…Reproduced with permission. [ 8 ] Copyright 2020, American Chemical Society.…”

“…[ 6 ] Additionally, the steric hindrance and the introduction of electrostatic interaction along the linear polymer chains can be also used to suppress the intermolecular interaction. [ 7,8 ]…”

100th Anniversary of Macromolecular Science Viewpoint: Re-examining Single-Chain Nanoparticles

“…Copyright 2018 Wiley. (D) Synthesis of single-chain Janus composite nanoparticle from PEO- b -P2VP- b -PS . Adapted with permission from ref .…”

Multi-stimuli-responsive bottlebrush-colloid Janus nanoparticles toward emulsion interfacial manipulation and catalysis

“…[20][21][22] It is reported that the poly (vinylpyridine) (PVP)-containing polymers were successfully intramolecularly crosslinked by the metallic ion of Cu 2+ and metallic complex of Co 2 (CO) 8 . 23,24 However, the crosslinked PVP segments lack active groups for further modification. On the other hand, carboxylic acid-containing polymers should be promising precursors to derive metal-containing SCNPs.…”