Construction of an efficient artificial light-harvesting system based on hyperbranched polyethyleneimine and improvement of photocatalytic performance

Abstract

An artificial light-harvesting system (ALHS) was developed in aqueous solution by employing the electrostatic co-assembly of a tetraphenylethylene derivative modified with two sulfonate groups (TPE-BSBO) and hyperbranched polyethyleneimine (PEI) as...

Carbazole-based artificial light-harvesting system for photocatalytic cross-coupling dehydrogenation reaction

“…Notably, the antenna effect of WPP5-CTD-ESY was determined to be 38.5 (Fig. S32, ESI†), which was much higher than that of recent artificial LHSs in water, 13–16,19,24,25 highlighting the potential advantage of carbazole functionalization for artificial light-harvesting.…”

“…Conversely, the natural light-harvesting process occurs in an aqueous environment and traditional LHS donors perform poorly due to the aggregation-caused quenching (ACQ) effect. 3–5 Recently, to improve the light-harvesting ability and realize energy transfer in water, an aggregation-induced emission (AIE)-based supramolecular strategy was utilized in aqueous photocatalysis, 12–16 bio-imaging, 17,18 and ion sensing, 19,20 because supramolecular assemblies can effectively simplify synthesis procedures and achieve efficient light-harvesting process in water. For example, Xing et al fabricated a supramolecular organic framework (SOF) by tetraphenylethylene derivative and cucurbit[8]uril (CB[8]), which successfully realized the cross-dehydrogenative coupling reactions of N -phenyl tetrahydroisoquinoline derivatives.…”

“…Notably, benefitting from the brilliant donor ability of CTD , the antenna effect of WPP5-CTD-ESY could reach 38.5, which is much higher than that of recently reported LHSs. 13–16,19,24,25 Moreover, according to the excellent light-harvesting ability, WPP5-CTD-ESY was further utilized as a catalyst for the photochemical reaction of benzothiazole and diphenylphosphine oxide. Fortunately, the photocatalytic product was successfully obtained and characterized by a single crystal structure, which displayed greater potential of WPP5-CTD-ESY in artificial light-harvesting developments (Scheme 1).…”

“…4b and Scheme S2, ESI†). 12–16 Initially, the photocatalytic conditions of WPP5-CTD , ESY and WPP5-CTDCG-ESY were first explored (Fig. 4c).…”

A water-soluble type II photosensitizer for selective photooxidation reactions of hydroazaobenzenes, olefins, and hydrosilanes in water

“…Building on our previous research in organic photocatalysis, 39–42 we have now developed a triphenylamine modified cyanophenylenevinylene derivative (TPCI), which not only has excellent water solubility, but also exhibits a wide absorption band ranging from 350–500 nm especially strong blue light absorption from 400 nm to 480 nm. Notably, the quenching of TPCI by water is negligible, allowing for the selective generation of singlet oxygen ( 1 O 2 ), an excellent reactive oxygen species (ROS) generated from type II photosensitizer with unprecedented high 1 O 2 quantum yield (Scheme 1b) in aqueous environments, which behaves with significant potential for application in photochemical oxidation, circumventing the necessity for organic solvents and oxidizing agents during the oxidation procedure.…”