Two-Dimensional Structural Motif in Thienoacene Semiconductors: Synthesis, Structure, and Properties of Tetrathienoanthracene Isomers
Bibliographic record
Abstract
Stille coupling of 2- and 3-(tributylstannyl)thiophene derivatives with tetrabromobenzene followed by oxidative cyclization provides a simple, two-step synthetic route to two isomeric tetrathienoanthracene structures ( 13 and 14 ). The materials are characterized by a remarkable thermal stability, both in air ( T dec ≈ 400 °C) and under nitrogen (sublimed with no decomposition at 450–500 °C). Optical studies of the parent and alkylated compounds showed sky-blue photoluminescence with quantum yields ranging between 0.17 and 0.40 and Stokes shifts of 0.03–0.16 eV. Both the optical properties and electrochemical behavior depend strongly on the position of the heteroatoms. Structural studies with X-ray crystallography (for 3D single crystals) and scanning tunneling microscopy (for 2D monolayers) indicate a high level of order, with similar intermolecular interactions for both isomers. The alkylated materials 13b and 14b have been used to fabricate thin-film transistors by both vacuum evaporation and solution processing. The preliminary studies show (unoptimized) hole mobilities of up to 7.4 × 10 −2 cm 2 V −1 s −1 and very high on/off ratios of up to 1 × 10 8 for vacuum-deposited films. The isomer 13, which showed higher thermodynamic stability of the radical cation and stronger intermolecular S···S contacts, also revealed better device performance.
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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".