Ultrabright Red-Emitting Photostable Perylene Bisimide Dyes: New Indicators for Ratiometric Sensing of High pH or Carbon Dioxide

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

New pH-sensitive perylene bisimide indicator dyes were synthesized and used for fabrication of optical sensors. The highly photostable dyes show absorption/emission bands in the red/near-infrared (NIR) region of the electromagnetic spectrum, high molar absorption coefficients (up to 100 000 m−1 cm−1), and fluorescence quantum yields close to unity. The absorption and emission spectra show strong bathochromic shifts upon deprotonation of the imidazole nitrogen atom, which makes the dyes promising as ratiometric fluorescent indicators. Physical entrapment of the indicators into a polyurethane hydrogel enables pH determination at alkaline pH values. It is also shown that a plastic carbon dioxide solid-state sensor can be manufactured by immobilization of the pH indicator in a hydrophilic polymer, along with a quaternary ammonium base. The influences of the plasticizer, different lipophilic bases, and humidity on the sensitivity of the sensor material are systematically investigated. The disubstituted perylene, particularly, features two deprotonation equilibria, enabling sensing over a very broad pCO2 range of 0.5 to 1000 hPa.

Originalspracheenglisch
Seiten (von - bis)10711-10720
Seitenumfang10
FachzeitschriftChemistry - A European Journal
Jahrgang24
Ausgabenummer42
DOIs
PublikationsstatusVeröffentlicht - 25 Jul 2018

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Carbon Dioxide
Carbon dioxide
Deprotonation
Coloring Agents
Dyes
Perylene
Solid-state sensors
Plasticizers
Polyurethanes
Hydrogel
Optical sensors
Quantum yield
Ammonium Compounds
Hydrogels
Atmospheric humidity
Polymers
Nitrogen
Fluorescence
Plastics
Infrared radiation

Schlagwörter

    ASJC Scopus subject areas

    • !!Chemistry(all)

    Dies zitieren

    Ultrabright Red-Emitting Photostable Perylene Bisimide Dyes : New Indicators for Ratiometric Sensing of High pH or Carbon Dioxide. / Pfeifer, David; Klimant, Ingo; Borisov, Sergey M.

    in: Chemistry - A European Journal, Jahrgang 24, Nr. 42, 25.07.2018, S. 10711-10720.

    Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

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