Structural and Spectroscopic Studies of the PCP-Bridged Heavy Chalcogen-Centered Monoanions [HC(PPh<sub>2</sub>E)(PPh<sub>2</sub>)]<sup>−</sup> (E = Se, Te) and [HC(PR<sub>2</sub>E)<sub>2</sub>]<sup>−</sup> (E = Se, Te, R = Ph; E = Se, R = <sup><i>i</i></sup>Pr): Homoleptic Group 12 Complexes and One-Electron Oxidation of [HC(PR<sub>2</sub>Se)<sub>2</sub>]<sup>−</sup>
Bibliographic record
Abstract
Selenium- and tellurium-containing bis(diphenylphosphinoyl)methane monoanions were prepared by oxidation of the anion [HC(PPh(2))(2)](-) with elemental chalcogens. The selenium-containing isopropyl derivative was synthesized by generating [H(2)C(P(i)Pr(2))(2)] via a reaction between [H(2)C(PCl(2))(2)] and 4 equiv of (i)PrMgCl prior to in situ oxidation with selenium followed by deprotonation with LiN(i)Pr(2). The solid-state structures of the lithium salts of the monochalcogeno anions TMEDA.Li[HC(PPh(2)E)(PPh(2))] (E = Se (Li7a), E = Te (Li7b)) and the dichalcogeno anions TMEDA.Li[HC(PR(2)Se)(2)] (R = Ph (Li8a), (i)Pr (Li8c)) revealed five- and six-membered LiEPCP and LiSePCPSe rings, respectively. The homoleptic group 12 complexes {M[HC(PPh(2)Se)(2)](2)} (M = Zn (9a), Hg (9b)) were prepared from Li8a and MCl(2) and shown to have distorted-tetrahedral structures; the nonplanarity of the carbon center in the PC(H)P unit of the Zn complex 9a is attributed to crystal-packing effects. The complexes Li7a, Li7b, Li8a, TMEDA.Li[HC(PPh(2)Te)(2)] (Li8b), Li8c, 9a, and 9b were characterized in solution by multinuclear ((1)H, (7)Li, (13)C, (31)P, (77)Se, (125)Te, and (199)Hg) NMR spectroscopy. One-electron oxidation of Li8a and Li8c with iodine in a variety of organic solvents produced [H(2)C(PR(2)Se)(2)] (R = (i)Pr, Ph) as the final product, presumably owing to hydrogen abstraction from the solvent. DFT calculations revealed a significant contribution from the p orbital on carbon to the SOMO of the radicals [HC(PR(2)Se)(2)](*) (R = (i)Pr, Ph).
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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 | 0.002 | 0.002 |
| Meta-epidemiology (narrow) | 0.006 | 0.006 |
| Meta-epidemiology (broad) | 0.007 | 0.002 |
| Bibliometrics | 0.001 | 0.004 |
| Science and technology studies | 0.003 | 0.004 |
| Scholarly communication | 0.002 | 0.003 |
| Open science | 0.004 | 0.003 |
| Research integrity | 0.003 | 0.005 |
| 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; both teacher heads agree on what is shown here.
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".