Vibrational spectroscopic study of the hydrated platinum(II), palladium(II) and <i>cis</i>‐diammineplatinum(II) ions in acidic aqueous solutions
Bibliographic record
Abstract
Abstract Mid infrared, far‐infrared and Raman spectroscopic studies, combined with force field analyses, were performed for the hydrated platinum(II) and palladium(II) ions and cis ‐diammineplatinum(II) complex in acidic aqueous solutions. Simplified Density Functional Theory (DFT) calculations were made for the equatorial plane of the platinum complexes. Careful subtraction of solvent spectra allowed a number of ‘internal’ modes of coordinated H 2 O and NH 3 to be determined as weak residual bands. The [Pt(OH 2 ) 6 ] 2+ and [ cis ‐Pt(NH 3 ) 2 (OH 2 ) 4 ] 2+ complexes were found to be six‐coordinated with four ligands strongly bound in an equatorial plane. The assignments of the vibrational modes in the equatorial plane could be performed on the basis of the experimental observations and by comparison with metal–ligand vibrations of square‐planar complexes, aided by normal coordinate calculations. For the weakly coordinated axial aqua ligands, the low wavenumber range and the polarizibility properties allowed the assignments of the bands at about 365 and 325 cm −1 to the stretching modes of one short and one longer Pt — O* bound to axial aqua ligands, respectively. A similar picture with even less strongly bound axial water molecules emerges from Raman spectroscopy data for the hydrated palladium(II) ion, [Pd(OH 2 ) 6 ] 2+ . The results are consistent with a description of the [Pt(OH 2 ) 6 ] 2+ and [Pd(OH 2 ) 6 ] 2+ aqua ions in C 4 v symmetry, and with the [ cis ‐Pt(NH 3 ) 2 (OH 2 ) 4 ] 2+ complex in the C s point group, and also in qualitative agreement with the structures devised from previous extended X‐ray absorption fine structure (EXAFS) measurements. Copyright © 2008 John Wiley & Sons, Ltd.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| 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
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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".