Binuclear and Starburst Organoplatinum(II) Complexes of 2,2‘-Dipyridylamino Derivative Ligands: Structures, Fluxionality, and Luminescence
Bibliographic record
Abstract
New binuclear and starburst trinuclear organoplatinum complexes based on 2,2‘-dipyridylamino (dpa) derivative ligands, Pt 2 Ph 4 (bab), bab = 1,4-bis(2,2‘-dipyridylamino)benzene, 1, Pt 2 Ph 4 (babp), babp = 4,4‘-bis(2,2‘-dipyridylamino)biphenyl, 2, Pt 3 Ph 6 (tab), tab = 1,3,5-tris(2,2‘-dipyridylamino)benzene, 3, Pt 3 Ph 6 (tat), tat = 2,4,6-tris(2,2‘-dipyridylamino)-1,3,5-triazine, 4, Pt 3 Ph 6 (tapb), tapb = 1,3,5-tris[ p -(2,2‘-dipyridylamino)phenyl]benzene, 5, Pt 3 Ph 6 (tapt), tapt = 2,4,6-tris[ p -(2,2‘-dipyridylamino)phenyl]-1,3,5-triazine, 6, Pt 3 Ph 6 (tabpb), tabpb = 1,3,5-tris{4‘-[4‘ ‘-(2,2‘-dipyridylamino)]biphenyl}benzene, 7, and Pt 3 Ph 6 (tabpt), tabpt = 1,3,5-tris{4‘-[4‘ ‘-(2,2‘-dipyridylamino)]biphenyl}benzene, 8, were synthesized by the reaction of [PtPh 2 (SMe 2 )] n with the corresponding chelate ligand. The structures of complexes 1 − 5 and 8 were determined by single-crystal X-ray diffraction. All eight complexes have phosphorescent emissions in the blue/green region at 77 K, attributed to ligand-centered π → π* transitions. Ligand-based fluorescent emission was also detected for complexes 5, 6, and 8 . Complexes 1 − 8 display versatile structures in the solid state. Complex 4 was found to be fluxional in solution. The key factors that influence the structures of the complexes in solution and the solid state are the degree of conjugation of the amino nitrogen lone pair electrons of the dpa unit with the central aromatic linker and intramolecular nonbonding interactions.
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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".