[Pb(ptz)(OH)(H<sub>2</sub>O)]: A Hybrid Nonlinear Optical Crystal with Large Birefringence
Bibliographic record
Abstract
The development of nonlinear optical (NLO) crystals remains crucial for solid-state laser applications. In this work, a chiral lead(II)-based hybrid material, [Pb(ptz)(OH)(H 2 O)] (Hptz = 5-(2-pyrazinyl)-1 H -tetrazole), was synthesized, exhibiting a one-dimensional chain structure assembled through stereochemically active lone pair (SCALP) Pb 2+ cations, OH –, and electronically asymmetric π-conjugated ptz – ligands. The combined influence of asymmetric π-conjugated organic ligands and SCALP-containing metal centers promotes noncentrosymmetric (NCS) crystal formation, yielding measurable optical properties, including 0.7 times KH 2 PO 4 (KDP) second-harmonic generation (SHG) efficiency, substantial birefringence (Δ n = 0.076 at 546 nm), and a 3.45 eV optical band gap. Structural characterization and computational studies attribute these optical characteristics to cooperative effects between distorted [PbO 3 N 2 ] polyhedra and aligned ptz – units, demonstrating that a strategic combination of SCALP metal cations with asymmetric π-conjugated organic ligands provides an effective pathway for designing hybrid linear/NLO materials.
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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 | 0.000 |
| 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 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".