Organometallic Oxides: Oxidation of the Cubane [(η-C<sub>5</sub>R<sub>5</sub>)Cr(μ<sub>3</sub>-O)]<sub>4</sub> and the Structures and Magnetic Properties of the Salts {[(η-C<sub>5</sub>R<sub>5</sub>)Cr(μ<sub>3</sub>-O)]<sub>4</sub>}{tcnq} and {[(η-C<sub>5</sub>R<sub>5</sub>)Cr(μ<sub>3</sub>-O)]<sub>4</sub>}{BF<sub>4</sub>}
Bibliographic record
Abstract
Differential pulse and current voltammetry for the cubane-like clusters [(η-C 5 R 5 )Cr(μ 3 -O)] 4 (R = H, Me; R 5 = H 4 Me) showed that [(η-C 5 H 4 Me)Cr(μ 3 -O)] 4 and [(η-C 5 Me 5 )Cr(μ 3 -O)] 4 were oxidized to {[(η-C 5 R 5 )Cr(μ 3 -O)] 4 } + and then to {[(η-C 5 R 5 )Cr(μ 3 -O)] 4 } 2+, but [(η-C 5 H 5 )Cr(μ 3 -O)] 4 was oxidized only to {[(η-C 5 H 5 )Cr(μ 3 -O)] 4 } + . Oxidation of [(η-C 5 Me 5 )Cr(μ 3 -O)] 4 ( 1 ) by AgBF 4 or tcnq gave {[(η-C 5 Me 5 )Cr(μ 3 -O)] 4 }{BF 4 } ( 2 ) or {[(η-C 5 Me 5 )Cr(μ 3 -O)] 4 }{tcnq} ( 3 ). It was shown by X-ray diffraction that the average Cr−Cr, Cr−O, and Cr−Cp* distances in 2 and 3 were 0.034(2), 0.007(5), and 0.02(1) Å shorter than those in 1, respectively. Compounds 1, 2, and 3 were antiferromagnetic, with similar intracluster exchange coupling constants, J (−262(23), −211(34), and −266(46) cm - 1, respectively). There was coupling between unpaired electrons on {[(η-C 5 Me 5 )Cr(μ 3 -O)] 4 } + and {tcnq} - in 3 at temperatures below 110 K.
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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 | 0.018 | 0.011 |
| Meta-epidemiology (narrow) | 0.020 | 0.019 |
| Meta-epidemiology (broad) | 0.020 | 0.008 |
| Bibliometrics | 0.011 | 0.025 |
| Science and technology studies | 0.012 | 0.022 |
| Scholarly communication | 0.010 | 0.013 |
| Open science | 0.019 | 0.015 |
| Research integrity | 0.011 | 0.015 |
| Insufficient payload (model declined to judge) | 0.001 | 0.003 |
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; both teacher heads agree on what is shown here.
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".