Terpyridine Molybdenum Dinitrogen Chemistry: Synthesis of Dinitrogen Complexes That Vary by Five Oxidation States
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Bibliographic record
Abstract
A bimetallic molybdenum complex bridged by an activated dinitrogen ligand and supported by phosphine and terpyridine ligands, [{((Ph)Tpy)(PPh2Me)2Mo}2(μ2-N2)][BArF(24)]2 [(Ph)Tpy = 4'-Ph-2,2',6',2″-terpyridine; ArF(24) = (C6H3-3,5-(CF3)2)4], was synthesized and structurally characterized, and its electronic structure was determined using a combination of experimental and density functional theory computational methods. Each molybdenum atom is best described as molybdenum(II) bridged by a modestly activated [N2](2-) ligand. The cyclic voltammogram of [{((Ph)Tpy)(PPh2Me)2Mo}2(μ2-N2)](2+) displays two reversible reductive and two reversible oxidative features, prompting the preparation and characterization of a series of molybdenum dinitrogen compounds spanning five oxidation states ([{((Ph)Tpy)(PPh2Me)2Mo}2(μ2-N2)][BArF(24)]n, where n = 4, 3, 2, 1, 0). Raman and (15)N NMR spectroscopic data establish that the bridging nitrogen ligand remains intact across the redox series. Electron paramagnetic resonance spectroscopy was used to probe the nature of the unpaired electron in the mixed-valent electronic oxidized and reduced products. The singly occupied molecular orbital is principally metal-based in [{((Ph)Tpy)(PPh2Me)2Mo}2(μ2-N2)](3+) and ligand-localized in [{((Ph)Tpy)(PPh2Me)2Mo}2(μ2-N2)](+).
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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 | 0.000 | 0.001 |
| 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 | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.021 | 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