Characterization of Ir(ppy)3 and [Ir(ppy)2 bpy]+ by infrared, Raman spectra and surface-enhanced Raman scattering
Version of Record online: 20 JUN 2010
Copyright © 2010 John Wiley & Sons, Ltd.
Journal of Raman Spectroscopy
Volume 42, Issue 3, pages 332–338, March 2011
How to Cite
Lai, S.-H., Ling, J.-W., Huang, Y.-M., Huang, M.-J., Cheng, C. H. and Chen, I.-C. (2011), Characterization of Ir(ppy)3 and [Ir(ppy)2 bpy]+ by infrared, Raman spectra and surface-enhanced Raman scattering. J. Raman Spectrosc., 42: 332–338. doi: 10.1002/jrs.2719
- Issue online: 20 MAR 2011
- Version of Record online: 20 JUN 2010
- Manuscript Accepted: 4 MAY 2010
- Manuscript Received: 21 DEC 2009
- National Science Council of Republic of China
The Raman and infrared spectra of fac-tris(2-phenylpyridinato-N,C2′)iridium(III), Ir(ppy)3 and surface-enhanced resonance Raman spectra of bis(2-phenyl pyridinato-) (2,2′bipyridine) iridium (III), [Ir(ppy)2 (bpy)]+ cation were recorded in the wavenumber range 150–1700 cm−1, and complete vibrational analyses of Ir(ppy)3 and [Ir(ppy)2 (bpy)]+ were performed. Most of the vibrational wavenumbers were calculated with density-functional theory agree with experimental data. On the basis of the results of calculation and comparison of the spectra of both complexes and their analogue [Ru(bpy)3]2+, we assign the vibrational wavenumbers for metal–ligand modes; metal–ligand stretching wavenumbers are 277/307 and 261/236 cm−1 for Ir(ppy)3, and 311/324, 257/270, 199/245 cm−1 for [Ir(ppy)2 bpy]+. Surface-enhanced Raman scattering spectra of [Ir(ppy)2 bpy]2+ were measured at two wavelengths on the red and blue edges of the low-energy metal-to-ligand charge-transfer band. According to the enhanced Raman intensities for the vibrational modes of both ligands ppy and bpy, the unresolved charge-transfer band is deduced to consist of charge-transfer transitions from the triplet metal to both ligands ppy and bpy. Copyright © 2010 John Wiley & Sons, Ltd.