In:
Inorganic Chemistry Frontiers, Royal Society of Chemistry (RSC), Vol. 10, No. 17 ( 2023), p. 5161-5166
Abstract:
Precise determination of oxygen concentrations is vital in a wide range of applications. Molecules with balanced phosphorescence and fluorescence can act as ratiometric oxygen sensors, and these single-molecule sensors represent the most accurate approach for oxygen sensing. Harnessing the different degrees of singlet–triplet state mixing induced by different lanthanides, a double-ring porphyrin (sinoporphyrin sodium, DVDMS) was simultaneously coordinated to gadolinium( iii ) and praseodymium( iii ) to balance the excited-state populations. The fluorescence and phosphorescence quantum yields for this lanthanide complex (PrGd-DVDMS) were 0.17% and 0.66%, respectively. Thus, the phosphorescence-to-fluorescence intensity ratio of PrGd-DVDMS was only 3 : 1; this compares very favorably with that for DVDMS coordinated to two gadolinium( iii ) ions (Gd 2 -DVDMS), which was 30 : 1. Furthermore, PrGd-DVDMS displayed excellent ratiometric oxygen sensing characteristics, and the uncertainty in its phosphorescence-to-fluorescence intensity ratio was considerably lower than that of Gd 2 -DVDMS. This new mixed-lanthanide porphyrin therefore has excellent potential as an oxygen indicator for applications such as environmental monitoring that require high reliability.
Type of Medium:
Online Resource
ISSN:
2052-1553
Language:
English
Publisher:
Royal Society of Chemistry (RSC)
Publication Date:
2023
Permalink