Dual‐Responsive Photocatalytic Polymer Nanogels

Abstract

Selective activation of photocatalysts under constant light conditions has recently been targeted to produce multiresponsive systems.H owever,c ontrolled activation, with easy recovery of the photocatalysts,i nduced by external stimuli remains am ajor challenge.M imicking the responsiveness of biological systems to multiple triggers can offer ap romising solution. Herein, we report dual-responsive polymer photocatalysts in the form of nanogels consisting of ac ross-linked poly-N-isopropylacrylamide nanogel, copolymerised with ap hotocatalytically active monomer.T he dual-responsive polymer nanogels undergo as tark decrease in diameter with increasing temperature,w hich shields the photocatalytic sites, decreasing the activity.T emperature-dependent photocatalytic formation of NAD + in water demonstrates the ability to switch photocatalysis on and off.M oreover,t he photocatalysed syntheses of several fine chemicals were carried out to demonstrate the utility of the designed material.

A PMMA-based heterogeneous photocatalyst for visible light-promoted [4 + 2] cycloaddition

“…Recently, our group published temperatureresponsive photocatalytic nanogels based on poly-Nisopropylacrylamide, demonstrating the versatility of combining photoactive units with well-known polymeric systems. 30 In general, the incorporation of photocatalytic properties into classical polymer networks via copolymerisation of photoactive monomers could be an effective strategy towards a novel class of efficient, cheap and metal-free photocatalysts. [31][32][33] Moreover, this combination may yield photocatalytic materials with considerable advantages in terms of stability and long-term usage for visible light-promoted redox catalysis.…”

Dispersible porous classical polymer photocatalysts for visible light-mediated production of pharmaceutically relevant compounds in multiple solvents

“…[29][30][31] This enhanced surface area may be utilised in conjunction with the recently developed organic small molecule photocatalytic monomers to produce a photocatalytically active porous classical polymeric material. 32 Moreover, this new material may provide a platform to produce a new class of polymer photocatalysts that are colloidally stable in a wide range of solvents. Easy control of photocatalyst conjugation length, highest occupied molecular orbital (HOMO) and lowest occupied molecular orbital (LUMO) levels may also be engineered into these new materials by varying the copolymerised photocatalytic moiety.…”

Visible Light-Induced Aerobic Oxidative Dehydrogenation of C–N/C–O to C=N/C=O Bonds Using Metal-Free Photocatalysts: Recent Developments

“…The reusability of the photocatalysts was studied by filtration and washing with CH 3 CN (for 48), and centrifugation (for 49 and 50), without observing remarkable changes in their activity. Other polymers recently employed in the same reaction leading to 2 were a melaminebased material (SC-HM, 51) [115], a nanogel composed of poly(N-isopropylacrylamide), N-(4-(7-(phenylbenzo[c][1,2,5]thiadiazol-4-yl)phenyl)acrylamide and polyethyleneglycol dimethylacrylate monomers 52 [116] and an organic polymer based on 1,3,5-triformylphloroglucinol and a terephthalohydrazide (TFG-BPTH, 53) [117]. These promoters enabled the preparation of N-benzylidene benzylamines 2 (for 52: Ar = Ph) in moderate to good conversions in all cases (Figure 10).…”