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Issue 4, 2010
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Highly luminescent Langmuir–Blodgett films of amphiphilic Ir(iii) complexes for application in gas sensing

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Abstract

Four members of mixed ligand cyclometalated iridium(III) complexes, fac-[Ir(ppy)nL3−n] (ppy = 2-phenylpyridine; L = 2-(3-octadecyloxyphenyl)pyridine; n = 0–3), were prepared in a one-pot reaction between [Ir(ppy)2(O⁁O)] (O⁁O = acetylacetonato) and LH in glycerol at 170 °C. Each compound was purified and optically resolved to Δ- and Λ-enantiomers chromatographically on a chiral column. A film of fac-[Ir(ppy)nL3−n] floating at an air–water interface was transferred horizontally onto a hydrophobic glass plate as a Langmuir–Blodgett (LB) film. The emission from a single layered LB film was monitored under the atmosphere of various kinds of gases. As a result, molecules with functional groups such as –OH, [double bond splayed left]C[double bond, length as m-dash]O and –CN were found to quench efficiently excited fac-[Ir(ppy)nL3−n] in a film. The effects of isotope and molecular chirality on energy transfer were also investigated, comparing the quenching ability between H2O and D2O or between R-2-butanol and S-2-butanol on a racemic or chiral film of fac-[Ir(ppy)2L], respectively.

Graphical abstract: Highly luminescent Langmuir–Blodgett films of amphiphilic Ir(iii) complexes for application in gas sensing

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Supplementary files

Article information


Submitted
28 Nov 2009
Accepted
04 Jan 2010
First published
15 Feb 2010

New J. Chem., 2010,34, 617-622
Article type
Paper

Highly luminescent Langmuir–Blodgett films of amphiphilic Ir(III) complexes for application in gas sensing

H. Sato, K. Tamura, M. Taniguchi and A. Yamagishi, New J. Chem., 2010, 34, 617
DOI: 10.1039/B9NJ00714H

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