Studies of Ligand Exchange in N-Heterocyclic Carbene Silver(I) Complexes

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• 作者：Haw-Lih Su ; Lisa M. P茅rez ; Sheng-Jui Lee ; Joseph H. Reibenspies ; Hassan S. Bazzi ; David E. Bergbreiter
• 刊名：Organometallics
• 出版年：2012
• 出版时间：May 28, 2012
• 年：2012
• 卷：31
• 期：10
• 页码：4063-4071
• 全文大小：480K
• 年卷期：v.31,no.10(May 28, 2012)
• ISSN：1520-6041

文摘

A series of N-heterocyclic carbene (NHC) Ag(I) complexes have been prepared and used to study the dynamics of NHC ligand exchange in these Ag(I) complexes. These studies used solution-state variable-temperature (VT) ¹³C NMR spectroscopy and the temperature-dependent changes in ¹³C鈥?sup>107/109Ag coupling to determine activation energies for the ligand exchange process. The effects of concentration, bridging anions, and additives on the exchange process have been studied. The experimental activation energies for the NHC ligand exchange processes of these silver complexes are also compared with DFT calculations. The results are consistent with an associative mechanism for the Ag(I)鈥揘HC exchange process.