Magnetic Relaxation Studies on Trigonal Bipyramidal Cobalt(II) Complexes
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Bibliographic record
Abstract
Abstract We report the preparation and the full characterization of a novel mononuclear trigonal bipyramidal Co II complex [Co(NS 3 i Pr )Br](BPh 4 ) ( 1 ) with the tetradentate sulfur‐containing ligand NS 3 i Pr (N(CH 2 CH 2 SCH(CH 3 ) 2 ) 3 ). The comparison of its magnetic behaviour with those of two previously reported compounds [Co(NS 3 i Pr )Cl](BPh 4 ) ( 2 ) and [Co(NS 3 t Bu )Br](ClO 4 ) ( 3 ) (NS 3 t Bu =N(CH 2 CH 2 SC(CH 3 ) 3 ) 3 ) with similar structures shows that 1 displays a single‐molecule magnet behaviour with the longest magnetic relaxation time (0.051 s) at T= 1.8 K, which is almost thirty times larger than that of 3 (0.0019 s) and more than three times larger than that of 2 (0.015 s), though its effective energy barrier (26 cm −1 ) is smaller. Compound 1 , which contains two crystallographically independent molecules, presents smaller rhombic parameters ( E= 1.45 and 0.59 cm −1 ) than 2 ( E= 2.05 and 1.02 cm −1 ) and 3 ( E= 2.00 and 0.80 cm −1 ) obtained from theoretical calculations. Compounds 2 and 3 have almost the same axial ( D ) and rhombic ( E ) parameter values, but present a large difference of their effective energy barrier and magnetic relaxation which may be attributed to the larger volume of BPh 4 − than ClO 4 − leading to larger diamagnetic dilution (weaker magnetic dipolar interaction) for 2 than for 3 . The combination of these factors leads to a much slower magnetic relaxation for 1 than for the two other compounds.
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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) | 0.000 | 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 | 0.000 |
| Insufficient payload (model declined to judge) | 0.015 | 0.001 |
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 it