Synthesis of Mixed NHC/L Platinum(II) Complexes: Restricted Rotation of the NHC Group
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- 作者：Christopher P. Newman ; Robert J. Deeth ; Guy J. Clarkson ; Jonathan P. Rourke
- 刊名：Organometallics
- 出版年：2007
- 出版时间：December 3, 2007
- 年：2007
- 卷：26
- 期：25
- 页码：6225 - 6233
- 全文大小：379K
- 年卷期：v.26,no.25(December 3, 2007)
- ISSN：1520-6041
文摘
The use of (NHC)AgX salts as transmetallating agentsfor platinum can be tuned to introduce either one or two NHCligands per platinum in high yield. Complexes with a singleNHC ligand are prepared with an additional DMSO ligand,which can conveniently be replaced by other ligands such asphosphines to give mixed cis NHC/phosphine complexes.Variable-temperature NMR and DFT have been used to probethe nature of the restricted rotation of the NHC ligand aboutthe square planar platinum center: experimentally, the barrierhas been established as at least 85 kJ mol-1, and thecomputational value has been determined to be 92 kJ mol-1.