Intermolecular energy transfer between tris(acetylacetonato)-lanthanoid complexes in n-butanol solution
- 1 January 1975
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 71, 1487-1496
- https://doi.org/10.1039/f29757101487
Abstract
Intermolecular energy transfer occurs between Tb(aa)33H2O and Ln(aa)33H2O complexes (Ln = Pr, Nd, Sm, Eu, Dy, Ho or Er; aa = acetylacetonate) in n-butanol solution at 293 K. Measurement of the decay time of the Tb3 + 5D4 level indicates that transfer occurs from this level to excited levels of the Ln3+ ions with bimolecular rate constants within the range 0.5–4.9 × 105 dm3 mol s–1. Data from similar measurements on a mixed crystal EuxTb(1–x)(aa)33H2O and other considerations indicate that this is a very short range electron-exchange transfer. Similar measurements of the Tb3+ ion phosphorescence yield indicate the presence of a further intermolecular transfer process between a higher excited state of the Tb3+ complex and the added Ln3+ complexes. The Stern–Volmer quenching constants vary from 11 dm3 mol–1 for Ho and Sm to 110 dm3 mol–1 for Pr. It is concluded that this transfer is unlikely to occur from either the ligand singlet or triplet levels and it is proposed that a higher Tb3+ level such as the 5D3 may be involved in both inter- and intramolecular energy transfer.Keywords
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