Theoretical Study of the Structure and Bonding of a Metal−DNA Base Complex: Al−Guanine
Bibliographic record
Abstract
Tautomerism in the most-stable isomers of Al−guanine complexes and their cations is studied with density functional theory and second-order perturbation theory calculations. Electron propagator calculations on vertical ionization energies and Dyson orbitals provide information on the electronic structure in the most-stable neutral doublets, as well as in the corresponding singlets and triplets. The Al−guanine complex consists of a positively charged Al ion with two localized valence electrons coordinated to a negatively charged guanine with an unpaired, delocalized π electron. Three isomers have very similar energies; however, the most-stable form has a markedly different ionization energy. Ionization energies for the second and third forms almost coincide. Predicted ionization energies are in close agreement with recent spectra. In all three cases, the first ionization energy corresponds to a cationic, singlet final state where the unpaired, delocalized π electron on guanine has been removed, whereas the second ionization energy corresponds to the removal of an electron from a 3s-like orbital on the Al ion. Changes in Mulliken charges and optimized structures between neutrals and cations confirm these qualitative conclusions.
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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".