Supramolecular Grid and Layer Architectures. Hydrogen Bonds and Halogen−Halogen Interactions Influenced by Bromo-, Chloro-, and Cyano-Substituted Anilic Acids
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Bibliographic record
Abstract
Supramolecular reactions were performed between 2,2‘-bipyrimidine (BPM) and 2,5-substituted cyano- and haloanilic acids [cyananilic acid (CNA), chloranilic acid (ClA), and bromanilic acid, (BrA)] under identical reaction conditions in methanol and a mixture of acetonitrile and methanol. The cyano and hydroxyl functional units of CNA in supramolecular compound 1 are hydrogen-bonded through water molecules and form a two-dimensional network with a grid motif. The grid cavities are occupied by BPM molecules, which are strongly linked by water molecules that connect to the CNA network. The supramolecular architecture of 1 thus consists of a three-dimensional hydrogen-bonded network. The 1:1:2 (H 2 O) compound 2 has intermolecular O−H···O and O−H···N hydrogen bonds: (i) ClA···H 2 O···BPM linked along the diagonal line of the bc -plane and (ii) BPM···H 2 O···BPM connected along the b -axis. This structure includes strong Cl···Cl interactions at 3.34 Å, which generate a three-dimensional packing arrangement as strengthened by acid···acid interaction. A new class of hydrogen-bonded 1:1:4 (H 2 O) supramolecular compound 3 is formed from BPM, BrA, and water molecules, where structure formation is directed by O−H···O and O−H···N hydrogen bonds, as well as weaker C−H···O and C−H···Br interactions between BPM and BrA. Remarkable Br···Br interactions at 3.68 Å are observed that are similar to the Cl···Cl interactions in 2 . The three supramolecular compounds have been prepared with the specific aim of assessing a new donor−acceptor-type of hydrogen-bonded interactions to control the architecture of organic solids for the further invention of supramolecular solid-state materials.
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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 | 0.001 |
| 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 it