Probing the Mechanism of Carbon−Hydrogen Bond Activation by Photochemically Generated Hydridotris(pyrazolyl)borato Carbonyl Rhodium Complexes: New Experimental and Theoretical Investigations
Bibliographic record
Abstract
Fast time-resolved infrared (TRIR) experiments and density functional (DFT) calculations have been used to elucidate the complete reaction mechanism between alkanes and photolytically activated hydridotris(pyrazoly-1-yl)boratodicarbonylrhodium. TRIR spectra were obtained after photolysis of Rh(Tp 4-tBu-3,5-Me )(CO) 2 in n -heptane, n -decane, and cyclohexane and of Rh(Tp 3,5-Me )(CO) 2 in n -heptane and cyclohexane. Initial photolysis produces a coordinatively unsaturated, 16-electron monocarbonyl species that vibrationally relaxes to an intermediate with ν CO of 1971 cm −1 in n -heptane solution (species A ). DFT calculations on Rh(Tp 3,5-Me )(CO)−RH (RH = C 2 H 6, C 6 H 12 ) suggest that A is the triplet state of a five-coordinate, square-pyramidal Rh(κ 3 -Tp 3,5-Me )(CO)−RH, in which the alkane is weakly bound. Within the first 2 ns, a new transient grew in at 1993 cm −1 (species B ). The calculations show that the observed species B is the singlet state of a four-coordinate Rh(κ 2 -Tp 3,5-Me )(CO)(RH), in which the alkane is strongly bound and one pyrazolyl ring is rotated, decoordinating one N. The transient due to B grew at the same rate as A partially decayed. However, A did not decay completely, but persisted in equilibrium with B throughout the time up to 2500 ps. The ν(CO) bands due to A and B decayed at the same rate as a band at 2026 cm −1 grew in (τ ca. 29 ns, n -heptane). The latter band can be readily assigned to the final alkyl hydride products, Rh(κ 3 -Tp 4-tBu-3,5-Me )(CO)R(H) and Rh(κ 3 -Tp 3,5-Me )(CO)R(H) (species D ). The experimental data do not allow the elucidation of which of the two alkane complexes, A or B, is C−H activating, or whether both of the complexes react to form the final product. The calculations suggest that a third intermediate (species C ) is the C−H activating species, that is, the final product D is formed from C and not directly from either A or B . Species C is nominally a five-coordinate, square-pyramidal Rh(κ 2 1 / 2 -Tp 3,5-Me )(CO)(RH) complex with a strongly bound alkane and one pyrazolyl partially decoordinated, but occupying the apical position of the square pyramid. Intermediate C is unobserved, as the calculations predict it possesses the same CO stretching frequency as the parent dicarbonyl. The unobserved species is predicted to lie on the reaction path between A and B and to be in rapid equilibrium with the four-coordinate species B .
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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".