Cyclometallated Pt(II) Complexes in Visible‐Light Photoredox Catalysis: New Polymerization Initiating Systems

Abstract

A household halogen lamp is used to promote the ring‐opening photopolymerization of epoxides in the presence of coumarin moiety containing Pt(II) complex/silane/iodonium salt combinations (epoxide/acrylate interpenetrated polymer networks can also be synthesized). Excellent polymerization profiles are obtained (conversions >70%) under this selected very soft irradiation. These Pt(II) complexes behave as photocatalysts in an oxidative cycle. A photoluminescent polymer can be in situ synthesized thanks to the luminescence properties of these complexes. The mechanisms are investigated by ESR, laser flash photolysis, and luminescence experiments.

New core-pyrene π structure organophotocatalysts usable as highly efficient photoinitiators

“…4) or the sulfonium salt TH (Fig. 1 in Supporting Information File 1) leads to an aryl radical Ar • (e.g., hyperfine coupling constants hfcs of the PBN adduct: a N = 14.2 G and a H = 2.2 G in agreement with known data [22–25 45]) in line with (r5). In the same way, phenacyl radicals and α-aminoalkyl radicals (r7 and r8 in Scheme 5) are observed in 1 Py_3 /PBr and 1 Py_3 /EDB (a N = 14.6 G, a H = 4.5 G and a N = 14.3 G, a H = 2.5 G, respectively; Fig.…”

Visible light sensitive photoinitiating systems: Recent progress in cationic and radical photopolymerization reactions under soft conditions

“…In addition to Ru or Ir complexes, other organometallic compounds based complexes have also been investigated for application in PISs, e.g., Mn, Fe, Cr, Mo, Zr, Pt, and Zn [132][133][134][135][136][137], but the efficiency is not so excellent for some of these compounds. A copper (II) complex with acylphosphinate as the counter anion has been developed and served as a visible light photoinitiator efficient for both Please cite this article in press as: Xiao P, et al Visible light sensitive photoinitiating systems: Recent progress in cationic and radical photopolymerization reactions under soft conditions.…”

Photochemical Production of Interpenetrating Polymer Networks; Simultaneous Initiation of Radical and Cationic Polymerization Reactions

“…The final coatings are tack-free. Such useful PIs in these novel dual photoinitiating systems are derived from dye structures and include e.g., diketopyrrolopyrrole-thiophene derivatives [107], mono and polyfunctional thiophene derivatives [108], indanedione skeleton [109], naphthalene scaffold [110], naphthalimide and naphthalic anhydride derivatives [111], anthraquinone derivatives [112], chalcone derivatives [113], push-pull malonate and malonitrile based compounds [114], naphthalimide based methacrylated derivatives [115], α-silicon polyoxomolybdate [116], acridinediones [117], difunctional acridinediones [118], Keggin-type polyoxometalate ion [119], push-pull structured indandiones [120], dimethyldihydropyrene [121], chromone based compounds [122], perylene bis-dicarboximides [123], pyrene derivatives [124], zinc complexes [125], pyridinium salts [126], pyrromethenes [127], trifunctional triazines [128], cyclometallated Pt(II) complexes [129], polyaromatic structures [130], and phenanthroline ligand containing Ru complex [131].…”

“…For example, various low viscosity blends of e.g., TMPTA/EPOX, TMPTA/DVE, TMSH/DVE can be polymerized under exposure to low intensity lights (intensity < 8 mW/cm ) emitted by household devices such as a halogen lamp [117,118,125,126,129], a fluorescent bulb (peaks at 430, 550 nm) [131], a blue led at 462 nm [109,132] and even sunlight (intensity ~2 mW/cm −2 ). Three representative examples are the following.…”