Near-IR Light-Induced Electron Transfer via Dynamic Quenching

Abstract

The utilization of near-infrared light is an important objective for the high-efficiency utilization of solar energy. Here, we describe a new class of a near-infrared light-induced electron transfer system using a distorted phthalocyanine as a photosensitizer. We revealed that the appropriate modification of distorted phthalocyanine affords a near-infrared absorbing dye with high photostability and long excitation lifetime, and a near-infrared light-induced electron transfer system was successfully established using the dye. The mechanistic investigation clarified that the electron transfer system works via a dynamic quenching mechanism. The system generated a long-lived anion radical species of the dye upon near-infrared light irradiation (>750 nm).

Proton‐Coupled Electron Transfer Induced by Near‐Infrared Light

“…Given that NIR light accounts for more than 40 % of the solar energy reaching on the earth, the construction of the NIR light‐induced PCET system is essential to utilise solar energy with high efficiency. Although we recently developed a novel electron transfer reaction induced by NIR light, the construction of NIR light‐induced PCET system has not been achieved . Herein, we report the first example of an NIR light‐induced PCET (NIR‐PCET) system.…”

“…Given that NIR light accounts for more than 40 %o ft he solar energy reaching on the earth, [6] the construction of the NIR light-induced PCET system is essential to utilise solar energy with high efficiency.A lthough we recently developed an ovel electron transfer reaction induced by NIR light, the construction of NIR light-induced PCET system hasn ot been achieved. [7] Herein, we report the first example of an NIR light-induced PCET (NIR-PCET)s ystem.I no ur NIR-PCET system, the back electron transfer reactionw as successfully suppressed, and the formed radical species exhibited ar elativelyl ong lifetime. We also confirmed the high reversibility and robustness of the system.…”

NIR Photocontrolled Organotellurium-Mediated Reversible-Deactivation Radical Polymerization by Activation of C–Te Bonds with Organotellurium Radicals

“…53−57 In addition, NIR light accounts for more than 40% of the sunlight reaching the earth, and research into NIR photochemistry will help to create conditions for the full use of natural sunlight. 58,59 However, the application of NIR light is still challenging, although some polymerization strategies have been successfully performed in ATRP, RAFT, and IMP because they are mainly dependent on photocatalysts (PCs) (Scheme 1a) and a handful of special catalysts involvement. 60−78 For example, in ATRP, the combination of a ppm copper(II) catalyst and a polymethine photosensitizer realized the NIR photoinduced ATRP.…”

“…Reversible-deactivation radical polymerization (RDRP), a robust technique for the synthesis of well-defined polymers, plays an important role in modern polymer science. − Based on the general reversible activation/deactivation mechanism of RDRP, − several techniques have been developed, such as nitroxide-mediated radical polymerization (NMP), − atom transfer radical polymerization (ATRP), − reversible addition–fragmentation chain transfer (RAFT) polymerization, − iodine-mediated polymerization (IMP), − and organotellurium-mediated radical polymerization (TERP). − In particular, the development of photochemistry has injected more opportunities and possibilities for RDRP because it is green, easy, and precisely controlled, and photons have been regarded as a 21st-century reagent. − However, most photoreactions could only take place in the UV–vis regions due to their energy limitations. − Unfortunately, side reactions and photocytotoxicity are inevitable in these short-wavelength regions. − Therefore, it has been the pursuit of scientists to strive for a push toward longer wavelengths. In particular, near-infrared (NIR) light is a favorite target, mainly because of its large penetration depth and high biosafety. − In addition, NIR light accounts for more than 40% of the sunlight reaching the earth, and research into NIR photochemistry will help to create conditions for the full use of natural sunlight. , However, the application of NIR light is still challenging, although some polymerization st...…”