Cadmium Dicyanoaurates and Their Reaction with Ammonia
Bibliographic record
Abstract
Abstract The synthesis and crystal structures of two anionic cadmium dicyanoaurate coordination polymers, [ n Bu 4 N] 6 [(Cd 4 Cl 4 ) 2 (Au(CN) 2 ) 12 ][CdCl 4 ] (TCCA) and [ n Bu 4 N] 2 [Cd(Au(CN) 2 ) 4 ], and their reaction with ammonia vapour is reported. TCCA and the isostructural [ n Bu 4 N] 6 [(Cd 4 Br 4 ) 2 (Au(CN) 2 ) 12 ][CdBr 4 ] form 3‐D arrays with [Cd 4 X 4 ] 4+ (X=Cl, Br) cubane clusters linked from each octahedral Cd(II) centre by three bridging [Au(CN) 2 ] − units. TCCA reacts with ammonia with concentrations of 1000 ppm or higher to give a product with a quantum yield of 0.88, while [ n Bu 4 N] 2 [Cd(Au(CN) 2 ) 4 ], which forms a 2‐D anionic Cd[Au(CN) 2 ] 2 sheet structure with axially pendant [Au(CN) 2 ] − units, reacts with concentrated ammonia vapour to generate Cd(NH 3 ) 2 [Au(CN) 2 ] 2 ; this has a similar 2‐D sheet structure but with axial NH 3 units. Vibrational spectroscopy illustrated that the reaction of both Cd/[Au(CN) 2 ]‐based materials with ammonia proceeded by breaking Cd‐NC bonds. For [ n Bu 4 N] 2 [Cd(Au(CN) 2 ) 4 ], this results in decomposition into [ n Bu 4 N][Au(CN) 2 ] ⋅ 0.5H 2 O and Cd(NH 3 ) 2 [Au(CN) 2 ] 2 , while the reaction of ammonia with TCCA is reversible by heating the ammonia‐bound sample above 110 °C. Cd[Au(CN) 2 ] 2 can be prepared by thermal removal of NH 3 units from Cd(NH 3 ) 2 [Au(CN) 2 ] 2 .
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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 | 0.000 | 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) | 0.000 | 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
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".