Thianthrene-based heavy metal-free oxygen analytes exhibiting room temperature phosphorescence and high sensitivity for low oxygen concentration
Journal
Sensors and Actuators B: Chemical
Journal Volume
430
Start Page
137380
ISSN
0925-4005
Date Issued
2025-05
Author(s)
Abstract
In this work, we present two very sensitive new heavy metal-free thianthrene-based oxygen analytes. Experimental results in combination with theoretical calculations, confirm that both the compounds display room-temperature phosphorescence, with a significant difference in intensity observed in air and oxygen-free environments. The compounds show long emission lifetimes reaching up to 27.08 ms. This indicates the involvement of oxygen-sensitive triplet emission which occur due to intersystem crossing. The compounds show record-high Stern-Volmer constants, reaching 1.57 × 10−2 ppm−1. These properties suggest that 2-(pentan-3-yl)-6-(anthracen-1-yl)-1H-benzo[de]isoquinolin-1,3(2 H)-dione and 4-(thianthren-1-yl)benzonitrile are perfect candidates for metal-free oxygen sensors with one of the highest sensitivity detection at low oxygen concentrations reported so far.
Subjects
Oxygen sensing
Room temperature phosphorescence
Thianthrene
SDGs
Publisher
Elsevier BV
Type
journal article