Synthesis and binding characteristics of novel calix[4]arene(amidocrown) diquinones
Bibliographic record
Abstract
A series of new calix[4]arene(amidocrown) diquinones (3a–3d) have been synthesized, characterized, and evaluated for cation recognition. It has been observed that 3b interacts with alkali metal ions (Li + , Na + , and K + ) and ammonium ions to induce an unprecedented downfield shift in the NH proton resonance, which can be attributed to polarization of the amidocrown ring of the calix[4]arene diquinone receptor. The observation has been confirmed by a significant anodic shift (Li + > NH 4 + > Na + > K + ) of the corresponding amidocrown-diquinone redox couple in cyclic and square wave voltammetric experiments. Both NMR and electrochemical studies of the binding characteristics of 3b with alkali metal cations and ammonium ions revealed a 1:1 binding stoichiometry for all and exhibited the highest association constant for lithium ions. This indicated that the receptor 3b selectively binds the lithium ion in preference to other alkali metal cations and ammonium ions.
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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".