Aggregation of Rare Earth Coordination Complexes in Solution Studied by Paramagnetic and DOSY NMR

Poh, Adeline; Aguilar, Juan; Kenwright, Alan; Mason, Kevin; Parker, David

Abstract

The degree of aggregation of neutral, 9‐coordinate rare earth coordination complexes has been shown to affect their ligand field, as revealed by diffusion‐ordered NMR spectroscopy (DOSY‐NMR) measurements on Y(III) complexes, paramagnetic NMR analyses of Yb and Tb analogues and emission spectral studies with the EuIII systems. In non‐polar media a lipophilic tris‐isopropyl complex, [Ln.L2] tends to aggregate in chloroform and dichloromethane giving rise to oligomers, whereas in acetic and trifluoroacetic acid the more polar parent complex, [Ln.L1], also aggregates, profoundly affecting the pseudocontact shift and the form of the Eu emission spectrum. Such behaviour has important implications in the design of responsive spectral probes.

Citation

Poh, A., Aguilar, J., Kenwright, A., Mason, K., & Parker, D. (2018). Aggregation of Rare Earth Coordination Complexes in Solution Studied by Paramagnetic and DOSY NMR. Chemistry - A European Journal, 24(60), 16170-16175. https://doi.org/10.1002/chem.201803766

• Journal Article Type: Article
• Acceptance Date: Jul 23, 2018
• Online Publication Date: Aug 30, 2018
• Publication Date: Aug 30, 2018
• Deposit Date: Sep 10, 2018
• Publicly Available Date: Aug 30, 2019
• Journal: Chemistry - A European Journal
• Print ISSN: 0947-6539
• Electronic ISSN: 1521-3765
• Publisher: Wiley
• Peer Reviewed: Peer Reviewed
• Volume: 24
• Issue: 60
• Pages: 16170-16175
• DOI: https://doi.org/10.1002/chem.201803766
• Public URL: https://durham-repository.worktribe.com/output/1320313