X-ray absorption spectroscopic studies on the iridium(III) complexes

Jin Ho Choy, Sung Ho Hwang, Joo Byoung Yoon, Chong Shik Chin, Moonhyun Oh, Hyunggeui Lee

Research output: Contribution to journalArticle

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Abstract

The iridium(III) complexes, 1-3, which are the key intermediates for a variety of well established reaction pathways for the metal-catalyzed reactions of alkynes such as oligomerization or polymerization, have been characterized by X-ray absorption spectroscopic analysis. According to the Ir LIII-edge X-ray absorption spectra for those complexes, the white lines for all the complexes represent a single peak, which suggests that the iridium(III) ions in the complexes are in a low spin state. From the least square fittings to XANES (X-ray absorption near edge structure) spectra, it has been found that the white line position for complex 3 is shifted to a lower energy side, and its area is smaller compared to the others, indicating that the ligand to metal charge transfer for the former becomes more significant than the latter. According to EXAFS (extended X-ray absorption fine structure) analyses, the spectral shapes clearly show the structural difference in the complexes between 1 or 2 and 3, which is well consistent with XANES results. The bond distances, d(Ir-C) and d(Ir-N), determined from EXAFS analyses, are reciprocally proportional to the IR frequencies, ν(C ≡ O) and ν(N = C), of the corresponding ligands, indicating that the bonds, Ir-C and Ir-N, are competing with the bonds, C ≡ O and N ≡ C.

Original languageEnglish
Pages (from-to)168-175
Number of pages8
JournalMaterials Letters
Volume37
Issue number3
DOIs
Publication statusPublished - 1998 Jan 1

Fingerprint

Iridium
X ray absorption
iridium
x rays
Metals
fine structure
Ligands
Oligomerization
ligands
Spectroscopic analysis
Alkynes
spectroscopic analysis
alkynes
metals
Charge transfer
Absorption spectra
polymerization
Polymerization
charge transfer
Ions

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

Cite this

Choy, Jin Ho ; Hwang, Sung Ho ; Yoon, Joo Byoung ; Chin, Chong Shik ; Oh, Moonhyun ; Lee, Hyunggeui. / X-ray absorption spectroscopic studies on the iridium(III) complexes. In: Materials Letters. 1998 ; Vol. 37, No. 3. pp. 168-175.
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X-ray absorption spectroscopic studies on the iridium(III) complexes. / Choy, Jin Ho; Hwang, Sung Ho; Yoon, Joo Byoung; Chin, Chong Shik; Oh, Moonhyun; Lee, Hyunggeui.

In: Materials Letters, Vol. 37, No. 3, 01.01.1998, p. 168-175.

Research output: Contribution to journalArticle

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