Synthesis and Bonding in the Diamagnetic Dinuclear Tantalum(IV) Hydride Species ([P<sub>2</sub>N<sub>2</sub>]Ta)<sub>2</sub>(μ-H)<sub>4</sub>and the Paramagnetic Cationic Dinuclear Hydride Species {([P<sub>2</sub>N<sub>2</sub>]Ta)<sub>2</sub>(μ-H)<sub>4</sub>}<sup>+</sup>I<sup>-</sup>([P<sub>2</sub>N<sub>2</sub>] = PhP(CH<sub>2</sub>SiMe<sub>2</sub>NSiMe<sub>2</sub>CH<sub>2</sub>)<sub>2</sub>PPh): The Reducing Ability of a Metal−Metal Bond
Bibliographic record
Abstract
The controlled reaction of the Ta(V) trimethyl species [P 2 N 2 ]TaMe 3, where [P 2 N 2 ] = PhP(CH 2 SiMe 2 NSiMe 2 CH 2 ) 2 PPh, under 0.5 atm of hydrogen gas produces a partially hydrogenated Ta(V) species, ([P 2 N 2 ]TaMe 2 (H), of unknown structure. Under 4 atm of hydrogen gas, further hydrogenation does not produce the complex [P 2 N 2 ]TaH 3; instead, reduction of the tantalum center occurs to yield the dinuclear Ta(IV) hydride ([P 2 N 2 ]Ta) 2 (μ-H) 4 . This diamagnetic tetrahydride fails to react with many reagents, including ethylene and carbon monoxide; however, upon addition of iodomethane, {([P 2 N 2 ]Ta) 2 (μ-H) 4 } + I - is produced as a paramagnetic green crystalline solid. The number of hydrides in this reaction product was confirmed by a deuterium labeling study. The results of a variable-temperature magnetic susceptibility study of this tetrahydride cation can be partially modeled with the Curie−Weiss law and a large correction for temperature-independent magnetism. Ab initio calculations using density functional theory were performed in an attempt to further understand the influence of the macrocyclic ligand in the bonding in these complexes.
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 | 0.029 | 0.017 |
| Meta-epidemiology (narrow) | 0.032 | 0.032 |
| Meta-epidemiology (broad) | 0.032 | 0.021 |
| Bibliometrics | 0.016 | 0.037 |
| Science and technology studies | 0.018 | 0.028 |
| Scholarly communication | 0.015 | 0.016 |
| Open science | 0.026 | 0.016 |
| Research integrity | 0.015 | 0.028 |
| Insufficient payload (model declined to judge) | 0.002 | 0.010 |
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".