Series of Lanthanide-Alkali Metal-Organic Frameworks Exhibiting Luminescence and Permanent Microporosity
Bibliographic record
Abstract
A series of permanently porous luminescent lanthanide frameworks of the general formula, [Na 6 (H 2 O) 6 ][Ln(L) 4 ](H 2 O) n Cl, Ln = Sm ( 1 ), Eu ( 2 ), Gd ( 3 ), Tb ( 4 ), and Dy ( 5 ), have been prepared by the reaction of trivalent lanthanide salts with sodium-4,4‘-disulfo-2,2‘-bipyridine- N, N ‘-dioxide, L. The structures are formed via the one-pot self-assembly of the anionic cubic metalloligand, [Ln(L) 4 ] 5-, and subsequent cross-linking with sodium cations and chloride to afford a three-dimensional network with two-dimensional channels. The cross-linking units involve [Na 4 Cl] 3+ clusters which resemble ideal faces of the halite structure. Both coordinated and uncoordinated water molecules, up to ∼80%, can be reversibly removed from 1 − 5 as identified using thermal gravimetric analysis/differential scanning calorimetry (TGA/DSC) leaving a rigid and porous framework with a Dubinin−Radushkevich (DR) surface area of 426 m 2 /g determined using CO 2 adsorption. The permanent microporosity of the framework is also supported by the energy level splitting in the luminescence spectra which are maintained in both the hydrated and mostly dehydrated frameworks. Compounds 1 − 5 were each characterized by X-ray crystallography, TGA/DSC, water and CO 2 sorption analyses, and luminescence spectroscopy.
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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".