Coordination of Terpyridine to Li+ in Two Different Ionic Liquids
datasetposted on 18.11.2013, 00:00 by Klaus Pokorny, Matthias Schmeisser, Frank Hampel, Achim Zahl, Ralph Puchta, Rudi van Eldik
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 π stacking mainly control the crystallization process.