Reduction of hexaammineruthenium(III) ions by a series of tris(polypyridyl)chromium(II) ions Revisiting the Cr(NN)<sub>3</sub><sup>3+/2+</sup> self-exchange rate
Bibliographic record
Abstract
The kinetics of the outer-sphere oxidation of Cr(NN) 3 2+ ions (NN = 2,2'-bipyridine, 1,10-phenanthroline, and their substituted analogs) by hexaammineruthenium(III) was studied using laser flash photolysis. The Cr(NN) 3 2+ ions were generated via the reductive quenching of the *Cr(NN) 3 3+ excited states by oxalate ions or by H 2 edta 2 . The second-order rate constants were found to vary with the driving force of the reaction. The rate constants increase from (7.1 ± 0.5) × 10 6 M 1 s 1 for Cr(5-Clphen) 3 2+ to (2.6 ± 0.2) × 10 8 M 1 s 1 for Cr(4,7-Me 2 phen) 3 2+ . The self-exchange rate constant for the couple (Cr(NN) 3 3+/2+ ) was calculated by applying Marcus cross relation to present and other known reactions of Cr(NN) 3 n+ ions, where n = 3 or 2 with various reactants and is estimated to be (6 ± 4) × 10 7 M 1 s 1 .Key words: tris(polypyridyl)chromium(II)/(III) self-exchange rate, hexaammineruthenium(III), oxidation of Cr(NN) 3 2+ .
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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".