New long-wavelength D–π-A–π-D chalcone photoinitiator for visible light polymerization with photobleaching and biocompatibility properties

Abstract

Four chalcones with large conjugated structures have been designed and synthesized. The excellent absorption properties of four chalcones in the visible region (λmax = 407 ~ 483 nm, εmax =...

Water-soluble bis-chalcone-based photoinitiators with long-wavelength absorption for radical polymerization and 3D printing

“…The experimental results were also consistent with our previous work. 27 The above results suggested that there could be charge transfer and redox reactions between photo-excited bis-chalcone and Iod, resulting in changes in absorption spectra.…”

“…The experimental results were also consistent with our previous work. 27 The above results suggested that there could be charge transfer and redox reactions between photo-excited bis-chalcone and Iod, resulting in changes in absorption spectra. For visible light photoinitiators, their color was often very deep due to their absorption in the visible light region.…”

“…In our previous work, 26,27 a series of oil-soluble photoinitiators were synthesized with λ max up to 500 nm. In this work, two water-soluble photoinitiators with long-wavelength absorption were synthesized by constructing the D–π–A–π–D structure and introducing a sulfonic acid group into a carbazole group.…”

Synthesis of One‐Component Type II Visible‐Light‐Absorbing Chalcones Containing Fused Aromatic Rings and Investigation of Free Radical Photopolymerization Properties

“…For Type II photoinitiators systems, chalcone-based compound was classified as a promising hydrogen acceptor photoinitiator due to the facile synthetic procedures and long absorption wavelengths. [19][20][21] For further boarding the light absorption regions of the chalcone, different chromophores such as triphenylamine, [22][23][24] carbazole, [22,25] phenothiazine, [26] aromatic ring, [27,28] heterocyclic structures [29] had been introduced by the researchers. Furthermore, symmetrical bis-chalcones combine two chromophores extended conjugation length more significantly, which were beneficial for the light harvesting.…”

Recent Advances in Monocomponent Visible Light Photoinitiating Systems Based on Sulfonium Salts

“…If this approach is of interest, photons of the visible spectrum exhibit lower energy than UV photons so that visible light photoinitiating systems of higher reactivity should be designed in order to compensate for this reduction of energy. To address this issue, a wide range of structures have been explored as exemplified by camphorquinone [29,30], thiophenes [31], push-pull dyes [2,32,33], anthracenes [34], acridine-1,8-diones [35], benzylidene ketones [36][37][38][39][40][41], chromones and flavones [42][43][44], perylenes [45], diketopyrrolopyrroles [46,47], naphthalimides [48][49][50][51][52][53][54], cyclohexanones [55][56][57][58], chalcones [24,[59][60][61][62][63][64], dithienophosphole derivatives [65], thioxanthones [66][67][68][69][70][71][72...…”