NMR Response of the Tetrel Bond Donor
Bibliographic record
Abstract
The tetrel elements (group 14) have the capacity to act as electrophilic sites and participate in structure-directing noncovalent tetrel bonds. We establish here the experimental response of several NMR interaction tensors to tetrel bonding via a range of 119 Sn and 35 Cl solid-state NMR experiments carried out in applied magnetic fields ranging from 4.7 to 21.1 T. Experimentally measured isotropic 1 J ( 119 Sn, 35 Cl) coupling constants and 35 Cl nuclear quadrupolar coupling constants ( C Q ) in a series of cocrystals of triphenyltin chloride, wherein tin acts as the tetrel bond donor atom, correlate with the experimental Sn···O tetrel bond length. Remarkably, the formation of moderately strong tetrel bonds to Ph 3 SnCl results in substantial reductions in 1 J ( 119 Sn, 35 Cl) and C Q by 27–45 and 20–36%, respectively. The experimental findings are reproduced by periodic gauge-including projector-augmented wave density functional theory (DFT) calculations as well as spin–orbit relativistic zeroth-order regular approximation DFT calculations. The trend established here in J couplings parallels that for hydrogen bond donors, providing experimental evidence for the analogy between the two classes of interactions. Tin chemical shift tensors and computed magnetic shielding tensors correlate less well with structure, suggesting that these are less suitable measures of tetrel bond strength. These results contribute to the elucidation of important analogies and differences between tetrel bonds and related classes of noncovalent interactions such as hydrogen bonds and halogen bonds. This work provides new insights, which should prove to be useful in future studies of related crystalline or amorphous systems featuring tetrel bonds and/or tetrel–halogen moieties such as halide perovskites and related photovoltaic and optoelectronic materials.
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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 | 0.001 |
| 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) | 0.003 | 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".