Polymorphism and Pseudopolymorphism of the [Ni(4-Methylpyridine)<sub>4</sub>(NCS)<sub>2</sub>] Werner Complex, the Compound that Led to the Concept of “Organic Zeolites”
Bibliographic record
Abstract
The inclusion chemistry of the title complex was revisited in the context of three topical problems of present-day crystal engineering: conventional and pseudo-polymorphism, the design of organic zeolite mimics, and the creation of “third generation” porous metal−organic frameworks. The crystal structures of dense (α) and microporous (β) polymorphs of the complex were redetermined and two new crystal structures were studied: β- and γ-inclusion phases of the complex (1:1 and 1:2 host-to-guest ratio, respectively) with benzene as the simplest aromatic guest. Although both the β- and γ-crystal architectures display a remarkable adaptability toward inclusion of various guests, the mechanisms of this adaptability are essentially different. The microporous β-phase is capable of expanding by 14.5% in response to the size of the included guest or variations in temperature. This flexibility is the highest ever observed for a metal−organic microporous framework and is responsible for the zeolitic behavior of the material. In contrast, the γ-phase shows an ability to transform to a number of architectures that are topologically similar but crystallographically different.
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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".