Synthesis, Characterization and Photobiological Studies of Ru(<scp>II</scp>) Dyads Derived from <i>α</i>‐Oligothiophene Derivatives of 1,10‐Phenanthroline
Bibliographic record
Abstract
Abstract Three new bis(2,2′‐bipyridine)‐heteroleptic Ru( II ) dyads incorporating thienyl groups ( n = 1–3, compounds 1, 2 and 3, respectively) appended to 1,10‐phenanthroline were synthesized and characterized to investigate the impact of n on the photophysical and photobiological properties within the series. All three complexes showed unstructured emission near 618 nm from a triplet metal‐to‐ligand charge transfer ( 3 MLCT ) state with a lifetime ( τ em ) of approximately 1 μs. Transient absorption measurements revealed an additional excited state that was nonemissive and long‐lived ( τ TA = 43 μs for 2 and 27 μs for 3), assigned as a triplet intraligand ( 3 IL ) state that was accessible only in 2 and 3. All three complexes were strong singlet oxygen ( 1 O 2 ) sensitizers, with quantum yields ( Φ ∆ ) for 2 and 3 being the largest (74–78%), and all three were photocytotoxic to cancer cells with visible light activation in the order: 3 > 2 > 1. Cell‐free DNA photodamage followed the same trend, where potency increased with decreasing 3 IL energy. Compounds 2 and 3 also showed in vitro photobiological effects with red light (625 nm), where their molar absorptivities were <100 m −1 cm −1 . These findings highlight that Ru( II ) dyads derived from α ‐oligothiophenes directly appended to 1,10‐phenanthroline—namely 2 and 3—possess low‐lying 3 IL states that are highly photosensitizing, and they may therefore be of interest for photobiological applications such as photodynamic therapy ( PDT ).
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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 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.002 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".