Licht als kleinstes Reagenz und Werkzeug

Baumann, H.; Ernst, U.; Goez, Martin; Griesbeck, Axel G.; Oelgemöller, Michael; Oppenländer, Thomas; Schlörholz, Matthias; Strehmel, Bernd

doi:10.1002/nadc.201490153

Cited by 14 publications

(11 citation statements)

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“…The latter requests to introduce functional groups promoting their water solubility; that is the sulfobutyl group in the case of R 1 or -SO 3 − in the case of either R 2 or R 3 . Water soluble cyanines could feasibly favor physical drying of aqueous dispersions upon irradiation with a NIR-LED [70]. In addition, chemical drying of coatings requires the use of strong anions promoting the solubility in organic surroundings.…”

Section: Review Synthesis Of Cyanines Absorbing In the Nirmentioning

confidence: 99%

Photophysics and photochemistry of NIR absorbers derived from cyanines: key to new technologies based on chemistry 4.0

Strehmel¹,

Schmitz²,

Kütahya³

et al. 2020

Beilstein J. Org. Chem.

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Cyanines derived from heptamethines were mainly discussed regarding their functionalization to broaden the solubility in different surroundings exhibiting either hydrophilic or hydrophobic properties and to tailor made the ΔG et photopysical properties with respect to absorption and fluorescence. Electrochemical properties were additionally considered for some selected examples. The cyanines chosen comprised as end groups either indolenine, benzo[e]- or benzo[cd]indolium pattern, which facilitated to shift the absorption between 750–1000 nm. This enabled their use in applications with light sources emitting in the near-infrared (NIR) region selected from high power LEDs or lasers with line-shaped focus. The absorbers considered were discussed regarding their function as sensitizer for applications related to Chemistry 4.0 standards. These were mainly photopolymer coatings, which can be found for applications in the graphic industry or to protect selected substrates. The huge release of heat on demand upon turning ON or OFF the NIR light source enables them for photothermal treatment in processes requesting heat to initiate either chemical (activated reactions) or physical (melting, evaporation) events.

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Section: Review Synthesis Of Cyanines Absorbing In the Nirmentioning

confidence: 99%

Photophysics and photochemistry of NIR absorbers derived from cyanines: key to new technologies based on chemistry 4.0

Strehmel¹,

Schmitz²,

Kütahya³

et al. 2020

Beilstein J. Org. Chem.

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“…The results discussed show for the first time baking of coatings with photonic technologies although such laser systems were successfully tested for physical drying of offset inks 9–11 or laser welding of plastics 14. In the current case, the NIR dye exerts two functions, i.e., the absorption of photons and their conversion into heat by internal conversion, and the generation of radicals by the reaction with an onium salt.…”

Section: Resultsmentioning

confidence: 99%

“…The development of modern lasers has led to systems generating a continuous shining line which, depending on the power, can exceed up to several meters length while the width in the focus is between a few micrometers and one millimeter. This has been successfully tested for physical drying of offset printing inks using an NIR absorber dye that selectively uptakes radiation 9, 10. These dyes possess a high quantum yield of non‐radiative deactivation while the efficiency to release fluorescence remains relatively low.…”

Section: Introductionmentioning

confidence: 99%

Digital Imaging of Lithographic Materials by Radical Photopolymerization and Photonic Baking with NIR Diode Lasers

et al. 2015

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Photo-initiated cross-linking of multifunctional acrylic esters in polymeric binders was investigated based on digital imaging using the Computer-to-Plate (CtP) technology applying laser exposure in the near-infrared (NIR). Generation of initiating radicals occurs by electron transfer from the excited state of the NIR-sensitizer to the radical generator, an onium salt. Iodonium salts derived from several borates and those with the bis(trifluoromethylsulfonyl)imide anion resulted in lithographic materials with high sensitivity. Photo-induced electron transfer plays a major function to generate initiating radicals by a sensitized mechanism but thermal events also influence sensitivity of the coating. Internal conversion was the major deactivation pathway while a certain fraction of NIR-dye fluorescence was also available. A line shape focused laser system with emission in the NIR was successfully used to bake the materials.

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“…Bedeutend für das Verständnis photochemischer und photophysikalischer Prozesse waren Nobelpreise für Blitzlichtphotolyse (1967: R. Norrish, G. Porter, M. Eigen ) und Femtosekundenspektroskopie (1999: A. Zewail ). Erkenntnisse der Grundlagenforschung haben zu zahlreichen technischen Anwendungen geführt: Photochemische Verfahren zur Reinigung und Entgiftung von Wasser und Luft (Photokatalyse mit TiO 2 [6d], Fe 2+/3+ /H 2 O 2 ; UV‐Strahler, Eximerlaserlampen mit kurzwelliger UV‐Strahlung), Drucktechnik (Lithografische Offsetdruckverfahren mit Halbleiterlaserdioden von 405 oder 820 nm), Photopolymere (Lackierungen, strahlenhärtbare Druckfarben, Informationsspeicherung, Stereolithografie, Holografie; Laser und LEDs mit Emissionen vom UV bis NIR Bereich), Medizin (photodynamische Diagnostik und Therapie, Dentaltechnik; Laser, LEDs mit Emissionen vom UV bis sichtbaren Bereich) [16]. Auch die solare Photochemie wird weiter verfolgt [17].…”

Section: Photonen Für Die Natürliche Oxygene Photosyntheseunclassified

Was Licht bewirken kann

Wöhrle

2016

Chemie in nserer Zeit

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Licht als kleinstes Reagenz und Werkzeug

Abstract: Grundlagenuntersuchungen zum Mechanismus kurzlebiger Zustände führen in der Photochemie zum Verständnis der Wirkprinzipien. Von diesen Erkenntnissen profitieren die industriellen Anwendungen.

Cited by 14 publications

References 0 publications

Photophysics and photochemistry of NIR absorbers derived from cyanines: key to new technologies based on chemistry 4.0

Photophysics and photochemistry of NIR absorbers derived from cyanines: key to new technologies based on chemistry 4.0

Digital Imaging of Lithographic Materials by Radical Photopolymerization and Photonic Baking with NIR Diode Lasers

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