Hydrogen-bonded adducts of triphenylsilanol with diamines: a finite ten-molecule aggregate, and chain, sheet and framework structures built from O—H...O, O—H...N and C—H...π(arene) hydrogen bonds
Bibliographic record
Abstract
The structures of five hydrogen-bonded adducts of triphenylsilanol, Ph3SiOH, with diamines have been determined. In the 4:1 adduct formed with 1,4-diazabicyclo[2.2.2]octane, (Ph3SiOH)4.C6H12N2 (I) (triclinic, P1, Z' = 2), there are two independent five-component aggregates built from O-H...N and O-H...O hydrogen bonds, in one of which the diamine exhibits orientational disorder: these two aggregates are linked into a cyclic ten-molecule unit by means of two independent C-H...pi(arene) hydrogen bonds. The 4:1 adduct formed with 1,2-bis(4-pyridyl)ethene, (Ph3SiOH)4.C12H10N2 (II) (triclinic, P1, Z' = 0.5), forms a similar five-component aggregate which lies across a centre of inversion: a single C-H...pi(arene) hydrogen bond links these aggregates into a molecular ladder. With N,N'-dimethylpiperazine, triphenylsilanol forms a 2:1 adduct, (Ph3SiOH)2.C6H14N2 (III) (monoclinic, P2(1)/c, Z' = 0.5), in which a three-component aggregate built from O-H...N hydrogen bonds lies across a centre of inversion: two independent C-H...pi(arene) hydrogen bonds link these aggregates into sheets. In the hydrated 2:1 adduct formed with 1,2-bis(4'-bipyridyl)ethane, (Ph3SiOH)2.C12H12N2.H2O (IV) (triclinic, P1, Z' = 1), a combination of two independent O-H...O and two independent N-H...O hydrogen bonds links the five molecular components into a centrosymmetric eight-molecule aggregate, and six independent C-H...pi(arene) hydrogen bonds link these chains into a continuous three-dimensional framework structure. In the dihydrated 2:1 adduct formed with 4,4'-bipyridyl, (Ph3SiOH)2.C10H8N2.(H2O)2 (V) (triclinic, P1, Z' = 1), a combination of four independent O-H...O and two independent N-H.O hydrogen bonds links the five molecular components into a chain of rings, and four independent C-H...pi(arene) hydrogen bonds link these chains into a continuous three-dimensional framework structure.
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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".