Exploring a New Family of (Phosphinochalcogenoyl)Europocenes for Magneto‐Optical Thermometry
Bibliographic record
Abstract
Abstract The development of novel materials based on lanthanide metallocenes remains a valuable endeavour, due to the synthetic accessibility, compositional tunability, and impressive magnetic and luminescent properties of this class of well‐studied compounds. Europium(II) complexes are particularly interesting in this regard, given the relative stability, strong paramagnetism, and characteristic Laporte‐allowed 5d→4f emission of this ion. In this study, we tap into the powerful class of phosphinocyclopentadienyl ligands to develop a novel family of potassium (bis(dimethylamino)phosphinochalcogenoyl)cyclopentadienides K[C 5 Me 4 (PCh(NMe 2 ) 2 ] of sulfur, selenium, and tellurium, and explore their coordination chemistry with Eu II . These ligands readily form homoleptic europocenes where the pendant phosphine chalcogenide arms also coordinate the europium center, and these are characterized via single‐crystal X‐ray diffraction, absorbance, and photoluminescence spectroscopy. Characterization via magnetic circular dichroism (MCD) spectroscopy reveals that these complexes act as extremely sensitive probes for MCD‐based magneto‐optical thermometry, reaching relative thermal sensitivities up to 170 % K −1 at cryogenic temperatures, with temperature uncertainties as low as 0.003 K. These complexes represent the first examples of organometallic MCD thermometers, and their remarkable properties and interesting structures highlight the promise of this new class of ligands and the utility of the Eu II ion in lanthanide‐based functional materials research.
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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 | 0.000 | 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) | 0.000 | 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".