Application of Time-Resolved Fluorescence Anisotropy To Probe Quinoline-Based Foldamers Labeled with Oligo(phenylene vinylene)
Bibliographic record
Abstract
A series of oligoquinoline carboxamides (Qn with n = 1–32) were prepared with an oligo(phenylene vinylene) (OPV) fluorophore covalently attached at one end via a rigid amide bond. The fluorescence decays of the OPV-Qn solutions in chloroform were acquired with a vertically polarized excitation and an emission that was either vertically or horizontally polarized to yield the fluorescence decays IVV(t) and IVH(t), respectively. The IVV(t) and IVH(t) decays were fitted globally assuming a monoexponential anisotropy. The fits were good, indicating that the theoretical triexponential anisotropy of these rigid symmetric top macromolecules was well represented by a single exponential over the range of Qn lengths studied. The rotational time retrieved from the global analysis of the IVV(t) and IVH(t) fluorescence decays was found to increase linearly with increasing oligoquinoline chain length in agreement with the notion that these macromolecules were foldamers that adopted a rigid helical conformation in solution. Furthermore, the hydrodynamic volume of the OPV-Qn constructs determined from their rotational times perfectly matched that expected from the known dimensions of the Qn samples obtained from single-crystal X-ray diffraction. Unfortunately, the small aspect ratio of the foldamers prevented the resolution of the separate rotational times that would be expected from symmetric top macromolecules whose geometry could be described as ellipsoids or cylinders. Consequently, reliable values for the D∥ and D⊥ diffusion coefficients representing the tumbling of the foldamers along and perpendicular to the main axis of the symmetric top macromolecule could not be obtained for the OPV-Qn foldamers. Nevertheless, the excellent correlation found between the foldamer size and rotational time suggests that time-resolved fluorescence anisotropy is a robust experimental technique to characterize the size and conformation of rigid foldamers in solution.
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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".