# Supplementary Material (ESI) for Chemical Communications
# This journal is © The Royal Society of Chemistry 2004
Supporting information
Experimental
Instrumentation: 1H-NMR and 13C-NMR spectra were measured using a Bruker
AMX-400 (400 MHz), EI Mass spectra were collected with a Bruker APEX II, and
Photoluminesence spectra were recorded with a HITACHI F-4500.
Preparation of green phosphorescence iridium complex, fac-Ir(ppy)3,
(ppy)2Ir(acac), mer-Ir(ppy)3 and mer-Ir(m-ppy)3: All procedures involving IrCl3•H2O
were carried out in nitrogen gas atmosphere. Cyclometalated Ir(III) μ-chloro-bridged
dimers were synthesized by the method reported by Nonoyama13. IrCl3•H2O (Next
Chimica) and 2.5 equiv. of 2-phenylpyridine ligands were heated in a 3:1 mixture of
2-ethoxyethanol and water. This slurry was heated at 100℃ for 24 hrs. After cooling
to room temperature, the precipitate, [C^N2Ir(μ-Cl)2IrC^N2], was filtered off and
washed with water. This dimer was divided into two parts and dry in 60℃.
First part, the obtained solid was placed in a flask and dispersed in
2-ethoxyethanol. Acetylacetone and sodium carbonate were added to the solution and
the mixture were heated at 120℃ for 12~16 hrs. After cooling to room temperature,
the crude product was filtered off and washed with water, followed by 2 portions of
n-hexane and ether. The solid was dried in vacuum and zone sublimed to give pure
product-(ppy)2Ir(acac).
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# Supplementary Material (ESI) for Chemical Communications
# This journal is © The Royal Society of Chemistry 2004
The give pure product-(ppy)2Ir(acac) was placed in a flask and dispersed in
glycerol. 2-phenylpridine was added to the solution and the mixture were refluxed for
15 hrs. After cooling to room temperature, the crude product was filtered off and
washed with water, followed by 2 portions of n-hexane and ether. The solid was dried
in vacuum and zone sublimed to give pure product- fac-Ir(ppy)3. fac-Ir(m-ppy)3 was
prepared from the same process.
Second part, two different dimer was placed in the train sublimation equipments
individually. The dimer was sublimed at 300℃ for 8~12 hrs and get the pure productmer-Ir(ppy)3 and mer-Ir(m-ppy)3.
All of these pure products were used for advanced analysis and device
fabrication.
fac-Ir(ppy)3: iridium (III) fac-tris(2-phenylpyridinato-N,C2’). EIMS: m/z 655,
[M]+. 1H-NMR (CD2Cl2, 300MHz): δ 7.92 (d, J = 8.1 Hz, 3H), 7.62-7.68 (m, 6H),
7.56 (d, J = 5.2 Hz, 3H), 6.86-6.95 (m, 6H), 6.73-6.82 (m, 6H). 13C-NMR (CD2Cl2,
75MHz) δ: 156.6, 151.2, 137.3, 134.0, 126.9, 126.4, 119.8, 114.2, 112.3, 110.0, 109.0.
fac-Ir(m-ppy)3: iridium (III) fac-tris(2-phenylpyridinato-N,C2’). EIMS: m/z 697,
[M]+. 1H-NMR (CD2Cl2, 300MHz): δ 7.73 (s, 3H), 7.64 (d, J = 7.6 Hz, 3H), 7.42 (d, J
= 5.3 Hz, 3H), 6.86 (t, J = 7.6 Hz, 3H), 6.71-6.76 (m, 9H), 2.42 (2, 9H). 13C-NMR
(CD2Cl2, 75MHz) δ: 156.1, 151.7, 137.9, 136.7, 134.1, 126.9, 119.5, 113.9, 113.3,
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# Supplementary Material (ESI) for Chemical Communications
# This journal is © The Royal Society of Chemistry 2004
109.8, 109.7, 11.2.
(ppy)2Ir(acac): iridium (III) bis(2-phenylpyridinato-N,C2’)acetylacetonate. EIMS:
m/z 600, [M]+. 1H-NMR (CD2Cl2, 300MHz): δ 8.53 (d, J = 5.7 Hz, 2H), 7.91 (d, J =
8.0 Hz, 2H), 7.81 (t, J = 7.3 Hz, 2H), 7.61 (d, J = 7.5 Hz, 2H), 7.22 (t, J = 6.1 Hz, 2H),
6.88 (t, J = 7.3 Hz, 2H), 6.72 (t, J = 7.3 Hz, 2H), 6.27 (d, J = 7.6 Hz, 2H), 5.34 (s, 1H),
1.84 (s, 6H). 13C-NMR (CD2Cl2, 75MHz) δ: 174.9, 158.4, 138.4, 137.6, 135.3, 127.3,
123.3, 118.9, 114.0, 112.0, 111.0, 108.7, 90.5, 18.5.
mer-Ir(ppy)3: iridium (III) mer-tris(2-phenylpyridinato-N,C2’). EIMS: m/z 655,
[M]+. 1H-NMR (CD2Cl2, 400MHz): δ 8.09 (d, J = 5.6 Hz, 1H), 7.95-7.93 (m, 2H),
7.85 (s, 1H), 7.83 (s, 1H), 7.77 (d, J = 7.7 Hz, 1H), 7.72 (d, J = 7.7 Hz, 1H), 7.68-7.64
(m, 3H), 7.53-7.49 (m, 2H), 6.99-6.76 (m, 10H), 6.59 (d, J = 6.8 Hz, 1H), 6.42 (d, J =
7.6 Hz, 1H). 13C-NMR (CD2Cl2, 100MHz) δ: 167.4, 165.2, 160.6, 158.5, 157.8, 149.6,
143.3, 141.3, 138.0, 135.7, 135.1, 132.6, 127.8, 126.9, 125.9, 124.4, 122.8, 120.6,
120.0, 119.9, 119.6, 114.5, 114.4, 114.1, 112.5, 112.3, 111.6, 111.5, 111.1, 109.3,
109.0, 108.9, 108.6.
mer-Ir(m-ppy)3: iridium (III) mer-tris(2-phenyl 4-methylpyridinato-N,C2’). EIMS:
m/z 697, [M]+. 1H-NMR (CD2Cl2, 400MHz): δ 9.06 (d, J = 5.9 Hz, 1H), 7.76 (s, 1H),
7.73 (s, 2H), 7.64 (d, J = 7.7 Hz, 2H), 7.53 (d, J = 7.6 Hz, 1H), 7.42 (d, J = 5.7 Hz,
2H), 6.88-6.57 (m, 11H), 5.89 (d, J = 7.7 Hz, 2H), 2.67 (s, 3H), 2.42 (s, 6H).
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# Supplementary Material (ESI) for Chemical Communications
# This journal is © The Royal Society of Chemistry 2004
C-NMR (CD2Cl2, 100MHz) δ: 156.1, 151.7, 141.0, 138.4, 137.9, 136.7, 134.3,
13
134.1, 126.9, 120.7, 119.5, 119.0, 113.9, 113.5, 113.3, 111.3, 109.7, 109.6, 109.5,
11.2.
OLED Fabrication and Measurement: Pre-patterned ITO glasses with an
effective device of 0.16 cm2 were cleaned in detergent for 10min, and then washed
with large amount of doubly distilled water. After sonicated in pure water for 5 mins,
these glasses were dried in oven at 180℃ for 90 mins. The organic layers were
deposited thermally at a rate of 0.1 nm/sec and pressure of ~1x10-6 Torr in a
deposition system. Aluminum was deposited as the cathode. The
Electrophosphorescence data were measured with a SpectraScan PR650.
Electrophosphorescence spectra for the iridium complexes were showed in Fig 3.
It exhibits the same tendency with photoluminescence spectra.
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# Supplementary Material (ESI) for Chemical Communications
# This journal is © The Royal Society of Chemistry 2004
fac-Ir(ppy)3
(ppy)2-Ir(acac)
mer-Ir(ppy)3
mer-Ir(m-ppy)3
fac-Ir(m-ppy)3
Relative Intensity (a.u.)
1.0
0.8
0.6
0.4
0.2
0.0
350
400
450
500
550
600
650
700
750
800
wavelength (nm)
Fig. 3 EL spectra of iridium complexes.
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