Understanding the Properties of Donor‐Acceptor Substituted Boron Difluoride 3‐Cyanoformazanate Dyes
Bibliographic record
Abstract
π-Conjugated materials offer attractive traits including semiconductivity, low-energy light absorption/photoluminescence, and solution processability that render them ubiquitous within the organic electronics field. Among many strategies for property tuning, the creation of asymmetric electronic structures through the installation of donor and acceptor substituents commonly results in low-energy absorption/photoluminescence bands. Boron difluoride formazanate dyes are readily synthesized, can be asymmetrically substituted with donor and acceptor groups, and have unexpectedly low-energy absorption/photoluminescence bands that extend into the near-infrared. In this study, we prepared a series of donor-acceptor substituted boron difluoride 3-cyanoformazanate dyes and compared their properties to symmetric analogues. Our findings suggest that donor-acceptor derivatives are highly delocalized with properties intermediate of their symmetric counterparts. Furthermore, the data obtained suggest that the N-aryl substituents act as donors to the strongly accepting boron difluoride formazanate core, regardless of the functional groups appended to them. These properties were reproduced computationally, and while the frontier orbitals calculated for donor-acceptor dyes were modestly asymmetric, there was no evidence of charge-transfer character. This work provides significant insight into the unexpected properties of boron difluoride formazanates and reveals that their strongly accepting nature circumvents the predicted augmentation of electronic structure commonly observed for donor-accepter substituted dyes.
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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 | 0.001 |
| 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".