Multinuclear magnetic resonance studies of the aqueous products of the complexes <i>cis</i>- and <i>trans</i>-Pt(amine)<sub>2</sub>(NO<sub>3</sub>)<sub>2</sub>
Bibliographic record
Abstract
The hydrolyis or the aquation reactions of the compounds cis- and trans-Pt(amine)2(NO3)2 were studied in D2O in different conditions of pH. The products were characterized by multinuclear (195Pt, 13C, and 1H) magnetic resonance spectroscopy. In acidic medium, the product was [Pt(amine)2(D2O2)]2+ and for a few amines, trans- [Pt(amine)2(D2O)(NO3)]+ was detected. The 195Pt NMR resonances of the diaqua complexes were observed at higher fields for the cis compounds (avg. 1727 ppm) than for the trans isomers (avg. 1560 ppm). At basic pH, Pt(amine)2(OD)2 was formed and for ethylamine, trans-Pt(EtNH2)2(OD)(NO3) was detected. The cis compounds were also observed at higher fields than the trans isomers (1706 ppm vs. 1574 ppm). The coupling constants with 195Pt were geometry dependent. The avg. 2J(195Pt-1H) values for the diaqua species were 66 (cis) and 57 (trans) Hz, while the avg. 3J(195Pt-1H) were 43 (cis) and 34 (trans) Hz for the diaqua compounds, and 43 and 37 Hz, respectively, for the dihydroxo species. The 2J(195Pt-13C) avg. values were 18 (cis) and 12 (trans) Hz and the avg. 3J(195Pt-13C) were 31 (cis) and 23 (trans) Hz for both the diaqua and dihydroxo compounds. For the cis isomers, at neutral pH, the monoaquamonohydroxo species (avg. 1721 ppm) and the dihydroxo-bridged dimer (avg. 1353 ppm) were observed. For a few amines, the monohydroxo-bridged dimer was observed (avg. 1684 ppm) and its concentration increased with time. For the trans compounds, the monoaquamonohydroxo species was observed at 1563 ppm (avg.). For a few amines, the hydroxo-bridged dimer was present. For methylamine, a third species assigned to a higher oligomer was observed after 6 months.Key words: platinum, amine, nitrato, hydrolysis, NMR, aquation.
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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) | 0.002 | 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".