International Conference on Supramolecular Science and Technology (ICSS&T2004) location:Prague (Czech Republic) date:5-9 September 2004
Quinolines are usually known as a ligands for the
gravimetric analysis of lanthanide(III)ions. Pirtea mentioned this for the first time in 1937.1 Further research focused on thermal behaviour, infrared spectroscopy and behaviour in solution. Recently the quinolinates with erbium, neodymium and ytterbium came to interest because of their infrared luminescence.2
The literature concerning these types of complexes often
shows no or a very limited structural analysis. The structure is assumed to be Ln(C9H6NO)3, although some authors doubt this3. We tried to fill this gap by examining these compounds with NMR, ESI mass spectroscopy and CHN analysis. It became quite clear that the literature methods don't give products matching tris coordination. We found that the product consists of a mixture of compounds depending on the structure of the ligand used.
1. Pirtea T.: Z. Anal. Chem. 107, 191 (1937).
2. Van Deun R., Fias P., Driesen K., Binnemans K., Görller-
Walrand C.: Phys. Chem. Chem. Phys. 5, 2754 (2003)
3. Charles R., Perrotto A.: Anal. Chim. Acta 30, 131 (1964)