Abstract
An ultra-thin hybrid film of amphiphilic iridium(III) complexes and synthetic saponite was manipulated by means of the modified Langmuir-Blodgett method. In the film deposited onto a quartz substrate, the external mixed molecular layer of amphiphilic iridium(III) complexes was reinforced by the inner layer of exfoliated synthetic saponite. As components of the molecular layer, two iridium(III) complexes were used: [Ir(dfppy)2(dc9bpy)]+ (dfppyH = 2-(4′,6′-difluorophenyl) pyridine; dc9bpy = 4,4′-dinonyl-2,2′-bipyridine) (denoted as DFPPY) and [Ir(piq)2(dc9bpy)]+ (piqH = 1-phenyisoquinoline)) denoted as PIQ). The emission spectra from the films changed from blue to red maxima with the decrease of a ratio of DFPPY/PIQ due to the energy transfer from excited DFPPY to PIQ. The intensity of red decreased with the increase of oxygen pressure through the quenching of excited iridium(III) complexes, promising a possibility as an oxygen-sensing film.
Highlights
Emission from an electronically-excited molecule is often used as a sensor output
A deposited hybrid film containing a mixture of DFPPY and PIQ was prepared as described in the experimental section and is denoted as {DFPPY-PIQ/SAP}
The results demonstrated that the emission from the present hybrid films responded to the partial pressure of oxygen, indicating the possibility of oxygen sensing
Summary
Emission from an electronically-excited molecule is often used as a sensor output. There have been a very large number of works accumulated to develop the molecules whose emission properties vary in response to the presence of other molecules or the variation of external circumstances. These are mostly concerned with molecules in a solution. Of higher practical value when it takes the form of a thin film [1,2,3,4]. Sensing luminescent films are advantageous from the viewpoint of portability, tunable size, and recycling
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