Ring-Opening Radical Clock Reactions for Hybrid Organic−Silicon Surface Nanostructures: A New Self-Directed Growth Mechanism and Kinetic Insights
Bibliographic record
Abstract
Cyclopropyl methyl ketone molecules react at single dangling bonds on an H-terminated Si(100) surface to form a metastable radical species attached via the oxygen atom. While the adsorbate has the capacity to abstract an H atom from an adjacent surface site, in analogy with the previously studied reaction of styrene, it appears not to do so. Rather, the cyclopropyl ring opens, thereby shifting the radical to a position distant from the point of attachment. H-abstraction then occurs from one of a variety of surface sites within range of the radical. The surface dangling bond created by abstraction allows the process to repeat, leading to the creation of a contiguous string of molecules attached to the surface. The assembly process follows a meandering path unlike in the case of styrene where H-abstraction is restricted to adjacent surface sites, resulting in straight multimolecular assemblies. This result hints at an opportunity to gain control over growth direction through judicious addition of constraints within the ring-opened radical adsorbates. Also, because the unimolecular rates of such ring opening reactions have been well characterized (“radical clocks”) we anticipate that in the future, the kinetics of the self-directed growth process may be determined.
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How this classification was reachedexpand
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 | 0.000 |
| 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 itClassification
machine, unvalidatedMachine predicted; a candidate call from one teacher head, 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".