Six Lanthanide-Coordination Polymers Based on 2-Fluoroisonicotinic Acid: Synthesis, Structure, Luminescence and Magnetic Properties
Bibliographic record
Abstract
Abatract: Six new 1D lanthanide-based coordination polymer helical chains with formulas of {[Ln(FINA)3(H2 O)2 ]· H2 O}n(Ln=Pr(1), Nd(2), Eu(3), Gd(4)), {[Dy(FINA)3(H2 O)2 ]}n(5), and {[Gd(FINA)2(phen)(OH)]}n(6)(HFINA=2-Fluoroisonicotinic acid, phen=1,10-phenthroline), were synthesized and structurally characterized. It is the first time that 2-Fluoroisonicotinic acid is employed in producing coordination polymers. Carboxylate moieties of the ligand in these compounds exhibit two types of coordination modes because of the lanthanide contraction effect. Ln3+ion is coordinated by eight donor atoms in a distorted bicapped trigonal-prismatic arrangement in 1~4 while in distorted dodecahedron geometry in 5~6. All of helical chains are further extended via the intermolecular π… π interactions, strong O-H … O/N hydrogen bonds and C-H … F hydrogen bonds into a 3D supramolecular structures. Interestingly, in 1~4, there is a small 1D solvent channel along the b-axis, where water molecules are located. The luminescence properties of 3 and 4 have been investigated and the result indicate that compound 3 displays intense red luminescence and exhibits the characteristic transition of the Eu3+ion with a decay lifetime of 333.81 μs, while 4 would be attributed to the intraligand fluorescence, based on the emission spectrum of the free ligand. The magnetic properties of 2 ~6 reveal the weak antiferromagnetic characters. Additionally, the thermal analyses suggest the high thermal stability of compounds 1~6. CCDC: 977317, 1; 977318, 2; 977319, 3; 977320, 4; 977321, 5; 977322, 6.
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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 | 0.001 |
| 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) | 0.004 | 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".