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 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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 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".