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X. Zhang et al. / Inorganic Chemistry Communications 12 (2009) 758–760
Table 1
Absorption and emission data of 2–4b.
Medium
kabs/nm (
e
/dm3 molꢀ1 cmꢀ1
)
298 K
77 K
kem/nma
s
/
ls
Uem
kem/nm
b
2
Solid
CH2Cl2
Solid
CH2Cl2
Solid
CH2Cl2
Solid
CH2Cl2
Solid
CH2Cl2
512
480, 510sh
498
472, 496
497
466, 495
502
469, 496
502
469, 493
0.107
0.018
0.099
0.146
0.047
0.059
0.055.
0.057
0.024
0.026
500, 512
452, 481
490, 519
457, 483
481, 512
452, 481
509
475, 501
495
469, 496
258 (42,650) 347 (6210) 388 (3490)
250 (38,590) 302 (13,320) 378 (3010)
248 (50,390) 302 (15,260) 378 (4370)
249 (73,950) 302 (24,940) 378 (6580)
249 (88,600) 306 (26,010) 376 (6070)
0.016
0.150
0.061
0.110
0.037
3a
3b
4a
4b
a
Emission spectra are recorded in 10ꢀ5 M of dichloromethane solutions at 298 K.
The emission quantum yields are measured using fac-Ir(ppy)3 (Uem = 0.40 [10a]) as the standard.
b
(d) D.-H. Lee, J.S. Choi, H. Chae, C.-H. Chung, S.M. Cho, Display 29 (2008) 436.
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2
3a
3b
4a
4b
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450
500
λem (nm)
550
600
Fig. 3. Emission spectra of 2–4b in dichloromethane solutions at 298 K.
(c) P.M. Werff, S.R. Batten, P. Jensen, B. Moubaraki, K.S. Murray, J.D. Cashion,
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In summary, four mono- and binuclear iridium(III) complexes
were prepared by substitution of the chloride in the precursor Ir(p-
py)2(PPh3)Cl with dicyanamide or tricyanomethanide. Stronger
field ligand substitution gave rise to an obvious blue shift of the
emission and 2.2 to 9.3-fold enhancements of the luminescence
quantum yields in 3a–4b.
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Acknowledgements
(b) Y.M. Wang, F. Teng, L.H. Gan, H.M. Liu, X.H. Zhang, W.F. Fu, Y.S. Wang, X.R.
Xu, J. Phys. Chem. C 112 (2008) 4743.
We thank financial supports from the NSFC, the 973 project
(2007CB815304) from MSTC, and NSF of Fujian Province
(2008I0027 and 2008F3117).
[8] M. Nonoyama, Bull. Chem. Soc. Jpn. 47 (1974) 767.
[9] Crystal data for 3aꢁCH2Cl2: C43H33Cl2IrN5P, M = 913.81, monoclinic, space
group P21/n, a = 17.352(7) Å, b = 9.391(3) Å, c = 24.936(10) Å, b = 99.942(7)°,
V = 4003(3) Å3, Z = 4, T = 293(2) K,
l
(Mo K
k = 0.71073 Å, 2h = 55°. The structure, refined on F2, converged for 9188 unique
reflections (Rint = 0.050) and 7722 observed reflections with I > 2 (I) to give
a ,
) = 3.546 mmꢀ1, Dc = 1.516 g cmꢀ1
Appendix A. Supplementary material
r
R1 = 0.0552 and wR2 = 0.1527 and a goodness-of-fit = 1.140. Crystal data for
ꢀ
Supplementary data associated with this article can be found, in
4bꢁ5/2CH2Cl2: C86.5H67Cl5F6Ir2N7P3: M = 1973.03, triclinic, space group P1,
a = 15.693(5) Å,
b = 69.636(12)°,
b = 16.502(5) Å,
c = 19.029(5) Å,
a
= 72.358(13)°
c
= 71.034(11)°, V = 4268(2) Å3, Z = 2, T = 293(2) K,
l(Mo
Ka
) = 3.389 mmꢀ1, Dc = 1.535 g cmꢀ1, k = 0.71073 Å, 2h = 55°. The structure,
refined on F2, converged for 14,611 unique reflections (Rint = 0.0519) and 9916
References
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