Photoinduced energy transfer in a rod-like dinuclear Ru(ii) complex containing bis-pyridyl-1,3,5-triazine ligands
Bibliographic record
Abstract
Three new rod-like dinuclear Ru(ii) polypyridine compounds have been prepared and characterized and their absorption spectra, redox behaviour and photophysical properties have been investigated, by conventional steady-state absorption and luminescence spectroscopic methods and by time-resolved methods operating in the nanosecond and femtosecond time regimes. All the new species contain 1,4-bis(2,2':6',2''-terpyridin-4'-yl)benzene () as bridging ligand and 2,4-bis(2-pyridyl)-6-p-bromophenyl-1,3,5-triazine and/or 4'-(p-bromophenyl)-2,2':6',2''-terpyridine as peripheral ligands. In particular, and are symmetric dyads since the Ru(ii) ions carry identical peripheral ligands (the triazine-based ligands in and the terpyridine-based ligands in the case of ), whereas is a non-symmetric dyad since its two Ru(ii) centers carry two different peripheral ligands (for the structural formulae of the compounds, see ). The absorption spectra and redox behaviour of the new compounds indicate, that each subunit of the dyads maintain its own peculiar properties in the dinuclear system, a requisite confirming the supramolecular nature of the systems. All the species exhibit metal-to-ligand charge-transfer (MLCT) emission, both at room temperature in fluid solution and at 77 K in rigid matrix. Luminescence lifetime and transient absorption spectroscopy reveal that efficient and fast photoinduced energy transfer takes place in the non-symmetric dyad from the subunit containing the terpyridine peripheral ligand to the subunit containing the triazine-based peripheral ligand. However, given the complexity of the transient spectra and the overlapping timescales of the processes of the symmetric and non-symmetric systems, any detailed analysis of the ultrafast results aimed at the identification of specific intercomponent energy transfer steps, and therefore to kinetically characterize the directional energy transfer, appears to be speculative.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".