Novel Blue Phosphorescent Group 15 Compounds MR<sub>3</sub> (M = P, Sb, Bi; R = <i>p</i>-(<i>N</i>-7-Azaindolyl)phenyl)
Bibliographic record
Abstract
New blue phosphorescent organometallic compounds of group 15, M[ p -C 6 H 4 ( N -7-azain)] 3 with M = P ( 1 ), Sb ( 2 ), Bi ( 3 ) and 7-azain = 7-azaindolyl, have been synthesized from the reaction of MCl 3 with Li[ p -C 6 H 4 ( N -7-azain)]. The crystal structures of these new compounds have been determined by single-crystal X-ray diffraction, which revealed that the group 15 elements in all three complexes are in a trigonal-pyramidal environment with the bond angles of C−M−C around the central atom decreasing from 1 to 3, attributed to the diminution of s character of the M−C bond and the size increase of the central atom. All three compounds are blue luminescent. Both fluorescent and phosphorescent emissions (λ max = 371 nm, λ max = 488 nm) were observed for compound 1 at 77 K. In contrast, at 77 K, only phosphorescence was observed for compounds 2 and 3 (λ max = 483 nm for 2; λ max = 478 nm for 3 ), attributable to the increased heavy-atom effects. Experimental data and molecular orbital calculations (restricted Hartree−Fock methods) support the view that luminescences from all three compounds are ligand-based emissions with contributions from the lone-pair electrons of the central atom. The orange Bi(V) compound Bi[ p -C 6 H 4 ( N -7-azain)] 3 Cl 2 ( 4 ) was obtained by the oxidation of 3 with PhI·Cl 2 . Compound 4 displays a distorted-trigonal-bipyramidal structure and a weak phosphorescence at λ max = 510 nm at 77 K, which is most likely caused by charge-transfer transitions from the chloride ligand to the Bi(V) center.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| 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) | 0.001 | 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 source (direct Gemma or distilled Codex), 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".