Zinc Porphyrins Covalently Bound to the Side Walls of Single-Walled Carbon Nanotubes via Flexible Bonds: Photoinduced Electron Transfer in Polar Solvent

Abstract

Single-walled carbon nanotubes (SWCNTs) tethering zinc porphyrins (ZnP) with flexible aliphatic bonds, ZnP-(spacer)-SWCNT, were prepared with applying the Prato reaction. Under illumination by visible light (>500 nm), ZnP-(spacer)-SWCNT effectively catalyzed the reduction of the benzylviologen dication (BV 2+ ) by 1-benzyl-1,4-dihydronicotinamide in dimethylformamide (DMF). The H 2 evolution was also confirmed when the ZnP-(spacer)-SWCNT aqueous solution was illuminated by visible light in the presence of Pt particles. Furthermore, the photocurrent and photovoltage were observed to respond to the on-off cycles of the visible light irradiation in a solar cell consisting of a transparent glass electrode modified with ZnP-(spacer)-SWCNT. The time-resolved fluorescence and absorption spectral measurements revealed the photoinduced electron-transfer mechanism.

Carbon nanotube catalysts: recent advances in synthesis, characterization and applications

“…This technique was also applied for CNT functionalization. [306][307][308][309][310][311] In a typical reaction, CNTs were dispersed in 1,2-dichlorobenzene. Under an argon atmosphere, 3-thiophenecarboxaldehyde was added to the mixture, followed by addition of a calculated amount of N-methylglycine extremely slowly.…”

“…For instance, zinc porphyrins covalently grafted to the side walls of SWNTs via Prado's reaction favoring the efficient intramolecular charge separation and intermolecular electron transfer and therefore lead to applications in solar energy conversion. 311 3.6.4 Other grafting methods. Although several grafting approaches have been studied for CNT surface functionalization, there are still some other grafting methods usually performed on carbon surfaces and can be attempted to functionalize CNT surfaces.…”

Functionalized Nanocarbons for Artificial Photosynthesis: From Fullerene to SWCNT, Carbon Nanohorn, and Graphene

“…The transient absorption peak at 900-1,000 nm (lifetime ≈ ca. 100 ns) observed for SWCNT/PyrIm→ZnPc is a clear evidence of the formation of ZnPc Reconstructed using fi gures from reference [ 44 ] supported. By utilizing k S CS ≈ 10 9 s −1 from the fl uorescence lifetime shortening, the k CS / k CR value, which is an index of CS stabilization, is ca.…”

“…When dialkyl viologen dication (RV 2+ ) is added as an electron-accepting mediator (RV •+ ) with an appropriate sacrifi cial hole shifter, RV •+ can be accumulated as a blue solution by the visible-light irradiation [ 44 ]. It is rather interesting to see that the extra electron on SWCNT, stabilized by the low LUMO and low CB (small E Red value (≈ − 0.5 V vs. Ag/AgCl) in Fig.…”

Microenvironment Effects in Electrocatalysis: Ionic‐Liquid‐Like Coating on Carbon Nanotubes Enhances the Pd‐Electrocatalytic Alcohol Oxidation

“…Synthetic and preparation procedures : 1,4‐Bis(imidazole‐1‐yl)butane(IL) was synthesized according to the literature 18. CNTs‐NH 2 was prepared following a reported procedure 14b. The fabricated route of the Pd@IL(Cl − )CNTs was summarized in Scheme .…”