Anhydrous perchlorato complexes of palladium(II): Pd(ClO<sub>4</sub>)<sub>2</sub>, (ClO<sub>2</sub>)<sub>2</sub>Pd(ClO<sub>4</sub>)<sub>4</sub>, and (NO<sub>2</sub>)<sub>2</sub>Pd(ClO<sub>4</sub>)<sub>4</sub>. Syntheses and structural analyses
Bibliographic record
Abstract
Chlorine trioxide (Cl2O6) reacts with PdCl2 to yield "ClO2Pd(ClO4)3" which is, in fact, an equimolar mixture of Pd(ClO4)2 and (ClO2)2Pd(ClO4)4. The chloryl salt decomposes under vacuum to give Pd(ClO4)2. (NO2)2Pd(ClO4)4· 0.5 NO2ClO4 is prepared using Pd(NO3)2·0.5 (H2O, HNO3) as the starting salt. Excess NO2ClO4 sublimes easily and pure (NO2)2Pd(ClO4)4 is obtained. Pd(ClO4)2 and (NO2)2Pd(ClO4)4 crystallize poorly; however, a P21/m space group is proposed for the latter. A complete assignment of vibrational modes, and DFT calculations, show that Pd(ClO4)2 is monomeric with chelating bidentate [ClO4] groups and Pd is in a square planar environment. In nitryl and chloryl salts, individual anions (Pd(ClO4)2-4), where unidentate [ClO4] groups interact partially with the cation or the Pd core, were characterized.Key words: palladium(II), chlorine trioxide, perchlorato complexes, chelating bidentate, vibrational spectroscopy, DFT calculations, powder X-ray diffraction.
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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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.003 | 0.001 |
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".