title: Engineering of efficient phosphorescent iridium cationic complex for developing oxygen-sensitive polymeric and nanostructured films.
abstract: In this study, a novel phosphorescent Ir(III) complex [Ir(2-phenylpyridine)2(4,4'-bis(2-(4-N,N-methylhexylaminophenyl)ethyl)-2-2'-bipyridine)Cl] (for convenience, the complex was given the synonym N-948) has been designed and synthesized, to be used as an oxygen probe. It was characterized by spectroscopic and analytical methods when incorporated in a polystyrene and nanostructured metal oxide support. N-948 is the first Ir complex in the literature with a luminescence emission at a wavelength higher than 650 nm (665 nm), with a quantum yield higher than 0.50 (0.58 +/- 0.05) and an extremely long phosphorescence lifetime (102 micros) which has been used for developing oxygen-sensitive films. In addition, the new complex shows a Stern-Volmer constant which is 20 times higher than that of other Ir complexes known from the literature when they are immobilized in polystyrene. The sensing film shows long-term stability (up to 12 months), complete reversibility of the signal quenched by oxygen and a quick response time to various oxygen concentrations (<2 s changing from 10 vol% pO2 to 90 vol% pO2). Thus, it is an interesting and promising complex for developing oxygen-selective sensors for gas analysis and the analysis of dissolved oxygen.
authors: Department of Analytical Chemistry, Faculty of Sciences, University of Granada, C/Fuentenueva, s/n E-18071 Granada, Spain.
authors: Antonio L
authors: AL
authors: Medina-Castillo
authors: Jorge F
authors: JF
authors: Fernández-Sánchez
authors: Cédric
authors: C
authors: Klein
authors: Mohammad K
authors: MK
authors: Nazeeruddin
authors: Antonio
authors: A
authors: Segura-Carretero
authors: Alberto
authors: A
authors: Fernández-Gutiérrez
authors: Michael
authors: M
authors: Graetzel
authors: Ursula E
authors: UE
authors: Spichiger-Keller
mesh_terms: D002412:Cations; D007495:Iridium; D049408:Luminescent Agents; D008163:Luminescent Measurements / Q000295:instrumentation / Q000379:methods; D036103:Nanotechnology; D009942:Organometallic Compounds / Q000097:blood / Q000138:chemical synthesis*; D010100:Oxygen / Q000097:blood*; D011108:Polymers
chemical_list: D002412:Cations; C525170:Ir(2-phenylpyridine)2(4,4'-bis(2-(4-N,N-methylhexylaminophenyl)ethyl)-2-2'-bipyridine)Cl; D049408:Luminescent Agents; D009942:Organometallic Compounds; D011108:Polymers; D007495:Iridium; D010100:Oxygen