Vibrational interactions in dimethylgold(III) halides and carboxylates
The far-infrared and Raman spectra of binuclear molecules [Me 2AuX] 2 (X = Cl, Br, I) and [Me 2Au(OOCR)] 2 (R = Me, CF 3, Bu t, Ph) in the 600–70 cm −1 region are reported. The experimentally measured vibrational frequencies of [Me 2AuX] 2 are in a good agreement with density functional theory predi...
Saved in:
Published in: | Vibrational spectroscopy 2009-11, Vol.51 (2), p.283-288 |
---|---|
Main Authors: | , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
Summary: | The far-infrared and Raman spectra of binuclear molecules [Me
2AuX]
2 (X
=
Cl, Br, I) and [Me
2Au(OOCR)]
2 (R
=
Me, CF
3, Bu
t, Ph) in the 600–70
cm
−1 region are reported. The experimentally measured vibrational frequencies of [Me
2AuX]
2 are in a good agreement with density functional theory predictions. The Au…Au vibrational interactions predicted to be in the 270–60
cm
−1 region of [Me
2AuX]
2 far-IR and Raman spectra have been observed. The Raman-active Au…Au vibrations of the [Me
2Au(OOCR)]
2 molecules were found to be in the same region as those of [Me
2AuX]
2. The Au–X stretching modes were observed between 100 and 250
cm
−1 in accordance with the DFT predictions. Their frequencies in the IR spectra of [Me
2AuX]
2 increase in the sequence I
<
Br
<
Cl while the AuC
2 stretching frequencies decrease in the same order. This fact might be an evidence of the decreasing covalent character of the gold-halogen bridges. The Au–O stretching bands of dimethylgold(III) carboxylates have been observed in the 500–250
cm
−1 region, and Au–C stretching frequencies of both [Me
2AuX]
2 and [Me
2Au(OOCR)]
2 compounds have been found between 600 and 500
cm
−1. |
---|---|
ISSN: | 0924-2031 1873-3697 |
DOI: | 10.1016/j.vibspec.2009.07.003 |