Structural Diversity of <i>Iso</i>-Maleonitrile Dithiolate d<sup>10</sup>s<sup>2</sup> Metal Complexes of Lead and Bismuth
Bibliographic record
Abstract
The synthesis and solid-state structures of four structurally diverse i -mnt-based anionic complexes and coordination polymers are described ( i -mnt = iso -maleonitrile dithiolate). ( n Pr 4 N) 4 [Pb 2 ( i -mnt) 4 ] is dimeric, containing a five-coordinate distorted square pyramidal Pb(II) center with a stereochemically active lone pair. The isoelectronic ( n Pr 4 N)[Bi( i -mnt) 2 ] is a distorted six-coordinate complex that crystallizes in the polar P2 1 space group and forms a 2D coordination polymer via intermolecular Bi–N interactions; the d 10 s 2 Bi(III) center also has a hemidirectional coordination sphere with a stereochemically active lone pair. Using the more compact (Me 4 N) + cation, (Me 4 N) 2 [Pb( i -mnt) 2 ] contains eight-coordinate holodirectional Pb(II) centers that form 1D chains via bridging Pb–S bonding. These anionic complexes could provide the foundation to incorporate stereochemically active lone pairs into heterometallic coordination polymers. As a comparison, ( n Pr 4 N) 3 Cr( i -mnt) 3 ·H 2 O was also prepared and has a propeller structure with a typical octahedral Cr(III) center.
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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) | 0.001 | 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".