Kinetic and mechanistic aspects of solid state, nanostructured porphyrin diacid photosensitizers in photooxidation of sulfides

Abstract

The kinetics and mechanism of aerobic photooxidation of sulfides in the presence of a series of electron-rich and electron-deficient porphyrins immobilized on Amberlyst 15 nanoparticles in the form of porphyrin diacids are reported.

Significantly Increased Stability of Donor–Acceptor Molecular Complexes under Heterogeneous Conditions: Synthesis, Characterization, and Photosensitizing Activity of a Nanostructured Porphyrin–Lewis Acid Adduct

“…The extent of catalyst degradation was found to be in the range of 9−37% in the presence of different lamps. As was reported elsewhere, 19 the maximum emission of the red and blue LED lamps occurs at 615 and 463 nm, respectively. In the case of the red and blue LED lamps, the full width at half-maximum is less than 20 nm.…”

“…46 The procedure was described elsewhere. [10][11][12][13][17][18][19]41 3. RESULTS AND DISCUSSION 3.1.…”

“…In the case of the red and blue LED lamps, the full width at half-maximum is less than 20 nm. 19 On the other hand, the white LED lamps have emission bands at both the red and blue regions. Also, in the spectrum of the latter, there are broad bands in 547−625 nm.…”

Type I ‘Lighted Metal‐free’ Photosensitizing Assemblies of Phenazine for Aerobic Oxidative Transformations

“…[5] In literature, a variety of metal based and "metal-free" photosensitizers have been reported which catalyze the oxidative organic transformations systematically. [6][7][8] Though efficient, transition metal based photosensitizers suffer from limitations such as use of costly/heavy metal, requirement of additional photoredox catalyst/oxidants and high catalyst loading. [8][9][10] To overcome these shortcomings, nowadays, much efforts have been focused on preparation of relatively economic organophotosensitizers based on commercially available and synthetic dyes.…”

Oxidative Coupling of Coumarins by Blue‐LED‐Driven in situ Activation of Horseradish Peroxidase in a Two‐Liquid‐Phase System

“…In addition, compound 1 is oxidized to the corresponding hydroperoxide 2 under blue‐LED driven condition by direct insertion of singlet oxygen at the tertiary α‐ethereal carbon atom (Figure 1), without formation of radical species [36] . The applications of blue‐LED in photochemistry has been reported, and the role of photosensitizers, such as meso ‐tetraphenylporphyrin ( meso ‐TPP) and iridium derivatives, adequately discussed [37–39] . Inspired by the ability of HRP to catalyze oxidative reactions using organic peroxides as alternative to H 2 O 2 , [40] we set up a novel blue‐LED driven 2LPs for the selective coupling of coumarins to bicoumarins.…”