High performance optical oxygen sensors based on iridium complexes exhibiting interchromophore energy shuttling.
A doubly pyrene-grafted bis-cyclometallated iridium complex with engineered electronically excited states demonstrates reversible electronic energy transfer between adjacent chromophores giving rise to extremely long-lived red luminescence in solution (τ = 480 μs). Time-resolved spectroscopic studies afforded determination of pertinent photophysical parameters including rates of energy transfer and energy distribution between constituent chromophores in the equilibrated excited molecule (ca. 98% on the organic chromophores). Incorporation into a nanostructured metal-oxide matrix (AP200/19) gave highly sensitive O2 sensing films, as the detection sensitivity was 200-300% higher than with the commonly used PtTFPP and approaches the sensitivity of the best O2-sensing dyes reported to date.
Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Avenida Fuentenueva s/n, 18071 Granada, Spain. jffernan@ugr.es.
Santiago
S
Medina-Rodríguez
Université Bordeaux/CNRS, ISM, 351 cours de la Libération, 33405 Talence Cedex, France. nathan.mcclenaghan@u-bordeaux.fr.
Sergey A
SA
Denisov
School of Chemistry, University of Birmingham, Edgbaston B15 2TT, UK. e.baranoff@bham.ac.uk.
Yanouk
Y
Cudré
School of Chemistry, University of Birmingham, Edgbaston B15 2TT, UK. e.baranoff@bham.ac.uk.
Louise
L
Male
Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Avenida Fuentenueva s/n, 18071 Granada, Spain. jffernan@ugr.es.
Marta
M
Marín-Suárez
Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Avenida Fuentenueva s/n, 18071 Granada, Spain. jffernan@ugr.es.
Alberto
A
Fernández-Gutiérrez
Department of Analytical Chemistry, Faculty of Sciences, University of Granada, Avenida Fuentenueva s/n, 18071 Granada, Spain. jffernan@ugr.es.
Jorge F
JF
Fernández-Sánchez
Université Bordeaux/CNRS, ISM, 351 cours de la Libération, 33405 Talence Cedex, France. nathan.mcclenaghan@u-bordeaux.fr.
Arnaud
A
Tron
Université Bordeaux/CNRS, LOMA, 351 cours de la Libération, 33405 Talence Cedex, France.
Gediminas
G
Jonusauskas
Université Bordeaux/CNRS, ISM, 351 cours de la Libération, 33405 Talence Cedex, France. nathan.mcclenaghan@u-bordeaux.fr.
Nathan D
ND
McClenaghan
School of Chemistry, University of Birmingham, Edgbaston B15 2TT, UK. e.baranoff@bham.ac.uk.
Etienne
E
Baranoff