Efficiency of polymer sensitizer in photosensitized reaction of tris(bipyridine)ruthenium(II) complex‐containing polymer

Abstract

Photochemical properties of Ru(bpy)2(poly‐4‐methyl‐4′‐vinyl‐2,2′‐bipyridine)Cl2 (2) were studied and compared with that of Ru(bpy)3Cl2. Continuous irradiation of a solution, which contains polymer 2 as a photosensitizer, methylviologen (MV2+) or 4,4′‐bipyridinium‐1,1′‐bis(trimethylenesulfonate) (SPV) as an electron acceptor and triethanolamine (TEOA) as a sacrificial donor, resulted in the formation of viologen radical ion (MV+ or SPV−). The rate of formation of MV+ or SPV− for the polymer 2 system was smaller than that for the Ru(bpy)3 Cl2 systems. The reason for this fact was kinetically analyzed by quenching experiments of excited Ru(II) complexes by MV2+ or SPV, the photosensitized reactions of the TEOA–Ru(II) complex–MV2+ or ‐SPV systems, and the dye laser photolysis of the Ru(II) complex–MV2+ or ‐SPV systems.

Preparation and Photophysical Properties of Amide-Linked, Polypyridylruthenium-Derivatized Polystyrene

“…We and others have been interested in the utilization of soluble polymers derivatized by the addition of polypyridyl complexes for the study of photoinduced electron and energy transfer. − Our previous linkage strategies involved the formation of ether or amide links in 1:1 styrene−4-substituted styrene copolymers. In these studies the polymers were prepared by free radical initiation, which gives samples of high polydispersity.…”

Di(isothiocyanato)bis(4-methyl-4’-vinyl-2,2’-bipyridine) Ruthenium(II) Films Deposited on Titanium Oxide-Coated, Fluorine-Doped Tin Oxide for an Efficient Solar Cell

“…-bipyridin-4-yl)ethanol [17,18] and 4-methyl-4'vinyl-2,2'-bipyridine [19] were synthesized according to the procedures in the literatures with some modifications. Di(isothiocyanato)-bis(4-methyl-4'-vinyl-2,2'-bipyridine)ruthenium(II) was prepared by a method similar to that of bis(2,2'-bipyridine)diisothiocyanatoruthenium(II) [20].…”

Copper-catalyzed C2 alkenylation of pyridine-N-oxides with alkynes

“…In the course of substrate expansion, we found a very interesting substrate 2,2′-bipyridine- N -oxides 1j (Scheme 3). With 5 mol% IPrCuCl as the catalyst, the vinyl substituted 2,2′-bipyridine 3ja was obtained, which is an important framework in photosensitizers 18 and photoswitchers, 19 as well as intermediates for synthesizing complex ligands. 20 To further demonstrate the compatibility and synthetic utility of these processes, transformations of the 2-alkenylpyridine 3aa were executed (Scheme 3).…”