Tailoring of organic dyes with oxidoreductive compounds to obtain photocyclic radical generator systems exhibiting photocatalytic behavior

• Christian Ley,
• Julien Christmann,
• Ahmad Ibrahim,
• Luciano H. Di Stefano and
• Xavier Allonas

Beilstein J. Org. Chem. 2014, 10, 936–947, doi:10.3762/bjoc.10.92

• transfer; kinetic; photocatalysis; photochemistry; photocyclic initiating system; photopolymerization; photoredox catalysis; radical generator; Introduction Among the possible usage of light, the conversion of photons into chemical energy, as stored into radicals or ions, is of great interest. As a part

• photolysis quantum yield of 0.19 for RB/TA is obtained. Photocyclic initiating system A typical photocyclic initiating system (PCIS) consists of a light absorbing dye (PS), an electron acceptor (A) and an electron donor (D) (Scheme 3). In such systems, upon irradiation photoinduced electron transfer reaction

• the dye. Simulation of photocyclic initiating system In the photocyclic system, the initial pseudo first-order reaction rates are equal to 3kq/A[TA]0 = 1.7·105 s−1 for TA (acceptor A) and 3kq/D[EDB]0 = 4.5·101 s−1 for EDB (donor D). This means that the oxidative photocycle preferentially occurs, at