Ultrahigh-Field Solid-State <sup>59</sup>Co NMR Studies of Co(C<sub>2</sub>B<sub>9</sub>H<sub>11</sub>)<sub>2</sub><sup>-</sup> and Co(C<sub>5</sub>H<sub>5</sub>)<sub>2</sub><sup>+</sup> Salts
Bibliographic record
Abstract
Cobalt-59 NMR spectra of stationary powder samples of salts containing Co(C 2 B 9 H 11 ) 2 - and Co(C 5 H 5 ) 2 + have been acquired at 21.14 T using single-echo stepped-frequency experiments. The resulting central transition, m I = 1/2 ↔ m I = −1/2, line shapes span more than 2.0 MHz and are dominated by the second-order quadrupolar interaction. Analysis of the spectra leads to C Q values of ca. 163 MHz for both ions, among the largest 59 Co C Q values reported. In addition, 59 Co chemical shift anisotropies are significant for Co(C 2 B 9 H 11 ) 2 - and Co(C 5 H 5 ) 2 +, with values of 4500−4700 and 5650 ppm, respectively. Isotropic 59 Co chemical shifts for the cobalticarborane anion are unavailable from NMR measurements of solution samples, probably because of the extremely short relaxation times anticipated for this complex.
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 | 0.005 | 0.003 |
| Meta-epidemiology (narrow) | 0.006 | 0.005 |
| Meta-epidemiology (broad) | 0.008 | 0.006 |
| Bibliometrics | 0.001 | 0.005 |
| Science and technology studies | 0.003 | 0.008 |
| Scholarly communication | 0.001 | 0.002 |
| Open science | 0.006 | 0.003 |
| Research integrity | 0.003 | 0.010 |
| 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; 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".