Coordination of Terpyridine to Li+ in Two Different Ionic Liquids

详细信息    查看全文

• 作者：Klaus Pokorny ; Matthias Schmeisser ; Frank Hampel ; Achim Zahl ; Ralph Puchta ; Rudi van Eldik
• 刊名：Inorganic Chemistry
• 出版年：2013
• 出版时间：November 18, 2013
• 年：2013
• 卷：52
• 期：22
• 页码：13167-13178
• 全文大小：670K
• 年卷期：v.52,no.22(November 18, 2013)
• ISSN：1520-510X

文摘

On the basis of ⁷Li NMR experiments, the complex-formation reaction between Li⁺ and the tridentate N-donor ligand terpyridine was studied in the ionic liquids [emim][NTf₂] and [emim][ClO₄] as solvents. For both ionic liquids, the NMR data implicate the formation of [Li(terpy)₂]⁺. Density functional theory calculations show that partial coordination of terpyridine involving the coordination of a solvent anion can be excluded. In contrast to the studies in solution, X-ray diffraction measurements led to completely different results. In the case of [emim][NTf₂], the polymeric lithium species [Li(terpy)(NTf₂)]_n was found to control the stacking of this complex, whereas crystals grown from [emim][ClO₄] exhibit the discrete dimeric species [Li(terpy)(ClO₄)]₂. However, both structures indicate that each lithium ion is formally coordinated by one terpy molecule and one solvent anion in the solid state, suggesting that charge neutralization and 蟺 stacking mainly control the crystallization process.