The Platinum Center is a Stronger Nucleophile than the Free Nitrogen Donors in a Dimethylplatinum Complex with a Dipyridylpyridazine Ligand
Bibliographic record
Abstract
The ligand 1,4-di-2-pyridyl-5,6,7,8,9,10-hexahydrocycloocta[ d ]pyridazine (6-dppd) contains two potential chelate groups, but it coordinates to only one dimethylplatinum group in forming the complex [PtMe 2 (6-dppd)], 1 . Complex 1 contains a free pyridyl and a free pyridazine nitrogen donor, but it fails to coordinate to ZnCl 2 or to CuCl to give a bimetallic complex. Complex 1 reacted with mercury(II) salts HgX 2 (X = Cl, Br, OAc), not by coordination but by oxidative addition to the dimethylplatinum(II) center to give the platinum(IV) complexes [PtX(HgX)Me 2 (6-dppd)]. Complex 1 reacted with bromine or iodine by trans oxidative addition to give [PtX 2 Me 2 (6-dppd)], X = Br or I, but, when X = I, a more complex sequence of reactions also gave rise to products of cis oxidative addition and to the products [PtIMe 3 (6-dppd)] and [PtI 3 Me(6-dppd)], which arise through a methyl group transfer reaction. Complex 1 reacted with alkyl halides RX by trans oxidative addition to give [PtXRMe 2 (6-dppd)], R = Me, X = I; R = CH 2 Ph, X = Br; R = CH 2 -4-C 6 H 4 -CH 2 Br, X = Br. The cleavage of methyl groups from complex 1 by DCl gave a mixture of all isotopomers of methane, CH 4– n D n, indicating ready equilibration between hydrido(methyl)platinum(IV) and methaneplatinum(II) complex intermediates.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.001 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.008 | 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".