Abstract
Intramolecular energy transfer from a non-protonated phenanthridine chromophore to ytterbium occurs rapidly despite negligible overlap of the triplet state of phenanthridine with the absorption band of the metal centre. This can be explained by a sequential electron transfer and back electron transfer, or redox, mechanism. When the phenanthridine is protonated, this energy transfer pathway ceases to be thermodynamically feasible. Under these circumstances, energy transfer to the metal becomes rate determining and is mediated by the phenanthridinium triplet state, despite its near-zero spectral overlap with the metal-centred absorption band.
| Original language | English |
|---|---|
| Pages (from-to) | 1918-1922 |
| Number of pages | 4 |
| Journal | Journal of the Chemical Society, Dalton Transactions |
| Issue number | 9 |
| DOIs | |
| Publication status | Published - 2002 |
Keywords
- Physical process kinetics (luminescence; pH dependence of energy transfer mechanism in phenanthridine-appended ligand ytterbium complex in relation to); IR luminescence (near-IR; pH dependence of energy transfer mechanism in phenanthridine-appended ligand ytterbium complex in relation to); Electron transfer; Redox reaction; Triplet state (pH dependence of energy transfer mechanism in phenanthridine-appended ligand ytterbium complex in relation to); Intramolecular energy transfer (pH dependence of mechanism in phenanthridine-appended ligand ytterbium complex)