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Red‐ and Green‐Emitting Iridium(III) Complexes for a Dual Barometric and Temperature‐Sensitive Paint
Author(s) -
Fischer Lorenz H.,
Stich Matthias I. J.,
Wolfbeis Otto S.,
Tian Nan,
Holder Elisabeth,
Schäferling Michael
Publication year - 2009
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.200901511
Subject(s) - iridium , luminescence , phosphorescence , atmospheric pressure , materials science , oxygen , infrared , analytical chemistry (journal) , chemistry , quenching (fluorescence) , acrylonitrile , photochemistry , polymer , fluorescence , optoelectronics , optics , copolymer , organic chemistry , composite material , physics , oceanography , geology , catalysis
A new dual luminescent sensitive paint for barometric pressure and temperature ( T ) is presented. The green‐emitting iridium(III) complex [Ir(ppy) 2 (carbac)] (ppy=2‐phenylpyridine; carbac=1‐(9 H ‐carbazol‐9‐yl)‐5,5‐dimethylhexane‐2,4‐dione) was applied as a novel probe for T along with the red‐emitting complex [Ir(btpy) 3 ], (btpy=2‐(benzo[b]thiophene‐2‐yl)pyridine) which functions as a barometric (in fact oxygen‐sensitive) probe. Both iridium complexes were dissolved in different polymer materials to achieve optimal responses. The probe [Ir(ppy) 2 (carbac)] was dispersed in gas‐blocking poly(acrylonitrile) microparticles in order to suppress any quenching of its luminescence by oxygen. The barometric probe [Ir(btpy) 3 ], in turn, was incorporated in a cellulose acetate butyrate film which exhibits good permeability for oxygen. The effects of temperature on the response of the oxygen probe can be corrected by simultaneous optical determination of T , as the poly(acrylonitrile) microparticles containing the temperature indicator are incorporated into the film. The phosphorescent signals of the probes for T and barometric pressure, respectively, can be separated by optical filters due to the ≈75 nm difference in their emission maxima. The dual sensor is applicable to luminescence lifetime imaging of T and barometric pressure. It is the first luminescent dual sensor material for barometric pressure/ T based exclusively on the use of Ir III complexes in combination with luminescence lifetime imaging.