This appears to be the first report of a strong modulation of
the photoluminescence response in Au(III) as a function of
non-chelating s-aryl ligands.
In summary, we have shown that pincer-stabilised gold(III)
hydroxides are versatile starting materials and react as mild
bases under C–H or N–H activation, or with boronic acids, to
give a variety of gold aryls, alkynyls and heteoaryls. The aryl
complexes (C4N4C)*AuR show pronounced modulation
of their photoemissions, from blue (R = C6F5) to yellow
(R = 2-C4H3S).
M. Manassero, J. Chem. Soc., Dalton Trans., 2000, 1261;
M. Bortoluzzi, E. De Faveri, S. Daniele and B. Pitteri, Eur. J.
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7 H. W. Roesky, S. Singh, K. K. M. Yusuff, J. A. Maguire and
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8 For the reactions of cationic N4N4C and N4N-chelated Au(III)
hydroxides with anilines and amines see M. A. Cinellu,
G. Minghetti, M. V. Pinna, S. Stoccoro, A. Zucca and
M. Manassero, Eur. J. Inorg. Chem., 2003, 2304.
9 The preparation of 4 is often accompanied by minor amounts of
the binuclear oxide [(C4N4C)*Au]2(m-O), which is hydrolysed to 4
during workup (see ESIw).
t
10 An analogue of 5 without Bu substituents has been made by a
This work was supported by the Leverhulme Trust and
Johnson Matthey plc. DAR thanks the University of East
Anglia for a studentship. We also thank Dr Yimin Chao
(UEA) for access to spectrophotometric facilities.
different route as a component in OLED films: N. Shirasawa,
N. Akino and T. Nakatani, US Pat. Appl., 2008/0114151, 2008,
Sumitomo Chem Co. Ltd.
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c
This journal is The Royal Society of Chemistry 2012
Chem. Commun., 2012, 48, 7247–7249 7249