Synthesis and characterization of a series of halide-bridged, multinuclear iron(ii) and cobalt(ii) diamido complexes and a dinuclear, high-spin cobalt(ii) alkyl derivative
Bibliographic record
Abstract
The synthesis and structural characterization of four multinuclear, halide-bridged iron(ii) and cobalt(ii) diamidosilylether complexes of the form{Fe(2)Br(2)[(tBu)NON]}(2) (1), {Co(2)Br(2)[(tBu)NON]}(2) (2), {Fe(2)Cl(2)[(tBu)NON]}(n) (3) and {Co(2)Cl(2)[(tBu)NON](LiCl)·2THF}(2) (4) ([(tBu)NON](2-) = [Me(3)CN(SiMe(2))](2)O(2-)) are reported. Thus, reaction of one equivalent of Li(2)[(tBu)NON] with two equivalents of MX(2) (X = Cl or Br; M = Co or Fe) form 1-4, which structurally contain one diamido ligand bridging two metal centres. Each amido group interacts with both metal centres to yield binuclear M(2)X(2)[(tBu)NON] units which dimerize via bromide bridges to form tetranuclear {Fe(2)Br(2)[(tBu)NON]}(2) (1) and {Co(2)Br(2)[(tBu)NON]}(2) (2) or form an infinite 1D chain of chloride-bridged dinuclear clusters {Fe(2)Cl(2)[(tBu)NON]}(n) (3). Replacing bromide for chloride in 2 results in a tetranuclear "ate" complex {Co(2)Cl(2)[(tBu)NON](LiCl)·2THF}(2) (4) in which the tetranuclear core is capped with one LiCl and two THF molecules on each side. The reaction of four equivalents of LiCH(2)SiMe(3) with 4 generated the high-spin cobalt(ii) alkyl complex {Co(2)(CH(2)SiMe(3))(2)[(tBu)NON]} (5), in which each amide in [(tBu)NON](2-) bridges two Co(ii) centres, but the silylether donor only binds to one metal; each Co(ii) centre has a terminal -CH(2)SiMe(3) unit bonded as well. Variable temperature (1.8-300 K) magnetic susceptibility data for 1-5 showed significant antiferromagnetic coupling between metal centres.
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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) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 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".