{Fe(NO)<sub>2</sub>}<sup>9</sup> Dinitrosyl Iron Complex Acting as a Vehicle for the NO Radical
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Bibliographic record
Abstract
To carry and deliver nitric oxide with a controlled redox state and rate is crucial for its pharmaceutical/medicinal applications. In this study, the capability of cationic {Fe(NO) 2 } 9 dinitrosyl iron complexes (DNICs) [( R DDB)Fe(NO) 2 ] + (R = Me, Et, Iso; R DDB = N,N ′-bis(2,6-dialkylphenyl)-1,4-diaza-2,3-dimethyl-1,3-butadiene) carrying nearly unperturbed nitric oxide radical to form [( R DDB)Fe(NO) 2 ( • NO)] + was demonstrated and characterized by IR, UV–vis, EPR, NMR, and single-crystal X-ray diffractions. The unique triplet ground state of [( R DDB)Fe(NO) 2 ( • NO)] + results from the ferromagnetic coupling between two strictly orthogonal orbitals, one from Fe d z 2 and the other a π* op orbital of a unique bent axial NO ligand, which is responsible for the growth of a half-field transition (Δ M S = 2) from 70 to 4 K in variable-temperature EPR measurements. Consistent with the NO radical character of coordinated axial NO ligand in complex [( Me DDB)Fe(NO) 2 ( • NO)] +, the simple addition of MeCN/H 2 O into CH 2 Cl 2 solution of complexes [( R DDB)Fe(NO) 2 ( • NO)] + at 25 °C released NO as a neutral radical, as demonstrated by the formation of [S 5 Fe(NO) 2 ] − from [S 5 Fe(μ-S) 2 FeS 5 ] 2– .
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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 | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 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 it