Strong Magnetic Coupling and Single‐Molecule Magnet Behavior in Tetrazinyl Radical‐Bridged Metallocenes
Bibliographic record
Abstract
Abstract Exchange coupling is essential in defining the magnetic behavior of polymetallic lanthanide‐based (Ln III ) single‐molecule magnets (SMMs), where, thanks to the unpaired electron(s), radical ligands show promise as magnetic bridges between the paramagnetic metal centers. Combining high‐performance lanthanide metallocene [Cp*₂Ln] + (Cp* = pentamethylcyclopentadienyl) units with the 3,6‐bis(2‐pyrimidyl)‐1,2,4,5‐tetrazine radical ligand (bmtz •− ) yielded two new radical‐bridged dinuclear lanthanide metallocenes, [(Cp*₂Ln)₂(bmtz •− )](BPh 4 )·Solvent (Ln = Gd ( 1 ), Solvent = THF; Dy ( 2 ), Solvent = toluene). The strong magnetic exchange coupling of J Gd–rad = ‐12.6 cm −1 observed in 1 , was probed via SQUID magnetometry as well as computational studies. This, combined with the highly anisotropic Dy III ions in 2 , leads to zero‐field SMM behavior and slow magnetic relaxation through thermally activated processes.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 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 | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".