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| Content Provider | Royal Society of Chemistry (RSC) |
|---|---|
| Author | Risberg, Emiliana Damian Skripkin, Mikhail Yu. Sandström, Magnus Lindqvist-Reis, Patric Bencze, Éva Mink, János Hajba, Laszló Abbasi, Alireza |
| Copyright Year | 2009 |
| Abstract | The strongly hydrogen bonded species (CH3)2SO⋯H3O+ formed in concentrated hydrochloric acid displays a new low energy feature in its sulfur K-edge X-ray absorption near edge structure (XANES) spectrum. Density Functional Theory-Transition Potential (DFT-TP) calculations reveal that the strong hydrogen bonding decreases the energy of the transition S(1s) → LUMO, which has antibonding σ*(S–O) character, with about 0.8 eV. Normal coordinate force field analyses of the vibrational spectra show that the SO stretching force constant decreases from 4.72 N cm−1 in neat liquid dimethyl sulfoxide to 3.73 N cm−1 for the hydrogen bonded (CH3)2SO⋯H3O+ species. The effects of sulfur coordination on the ambidentate dimethyl sulfoxide molecule were investigated for the trans-Pd((CH3)2SO)2Cl2, trans-Pd((CD3)2SO)2Cl2 and cis-Pt((CH3)2SO)2Cl2 complexes with square planar coordination of the chlorine and sulfur atoms. The XANES spectra again showed shifts toward low energy for the transition S(1 s) → LUMO, now with antibonding σ*(M–Cl, M–S) character, with a larger shift for M = Pt than Pd. DFT-TP calculations indicated that the differences between the XANES spectra of the geometrical cis and trans isomers of the M((CH3)2SO)2Cl2 complexes are expected to be too small to allow experimental distinction. The vibrational spectra of the palladium(II) and platinum(II) complexes were recorded and complete assignments of the fundamentals were achieved. Even though the M–S bond distances are quite similar the high covalency especially of the Pt–S bonds induces significant increases in the S–O stretching force constants, 6.79 and 7.18 N cm−1, respectively. |
| Starting Page | 1328 |
| Ending Page | 1338 |
| Page Count | 11 |
| File Format | HTM / HTML PDF |
| ISSN | 14779226 |
| Volume Number | 0 |
| Issue Number | 8 |
| Journal | Dalton Transactions |
| DOI | 10.1039/b814252a |
| Language | English |
| Publisher | Royal Society of Chemistry |
| Access Restriction | Open |
| Subject Keyword | Hydrogen Acid Sulfur K-edge X-ray absorption spectroscopy X-ray absorption near edge structure Antibonding molecular orbital Electronvolt Force field (fiction) Dimethyl sulfoxide Ford CD3 platform Chlorine Chemical bond |
| Content Type | Text |
| Resource Type | Article |
| Subject | Inorganic Chemistry |
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