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Comptes Rendus Chimie
Volume 18, n° 7
pages 766-775 (juillet 2015)
Doi : 10.1016/j.crci.2015.03.003
Received : 23 December 2014 ;  accepted : 19 Mars 2015
Effects of N -heteroaromatic ligands on highly luminescent mononuclear copper(I)–halide complexes
 

Hiroki Ohara a, Atsushi Kobayashi a, b, Masako Kato a,
a Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, 060-0810 Hokkaido, Japan 
b Precursory Research for Embryonic Science and Technology (PRESTO), Japan Science and Technology Agency (JST), Honcho 4-1-8, Kawaguchi, 332-0012 Saitama, Japan 

Corresponding author. Department of Chemistry, Faculty of Science, Hokkaido University, North-10 West-8, Kita-ku, Sapporo, 060-0810 Hokkaido, Japan.
Abstract

A series of mononuclear Cu(I)–halide complexes, [CuX(PPh3 )2 (L)] (X=Cl, Br, I; PPh3 =triphenylphosphine; L=pyridine (py), isoquinoline (iq), 1,6-naphthyridine (nap)), were synthesized. The emission color of [CuX(PPh3 )2 (L)] varies from blue to red by changing the L ligands and the halide ions, and all the complexes exhibit high emission quantum yields (0.16–0.99) in the crystals. The emission studies revealed that the emissive states of [CuX(PPh3 )2 (L)] differ depending on the L ligand. Complexes [CuX(PPh3 )2 (py)] and [CuX(PPh3 )2 (nap)] mainly emit from the singlet metal-to-ligand charge transfer mixed with the halide-to-ligand charge transfer (1(M+X)LCT) state at room temperature. In contrast, emissions from [CuX(PPh3 )2 (iq)] at room temperature originate from both 3(M+X)LCT and 3ππ* states. These results indicate that N -heteroaromatic ligands play an important role in the emission properties of mononuclear Cu(I)–halide complexes.

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Keywords : Copper, Mononuclear complexes, Luminescence, N -heteroaromatics




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