K <sub>3</sub> Mg <sub>2</sub> [K <sub>6</sub> MgCl <sub>3</sub> ][Ga <sub>20</sub> S <sub>36</sub> ]: A Diamond-like Framework Based on Mixed-Type Supertetrahedra for Excellent Nonlinear Optical Property
While individual supertetrahedra are well-established as building blocks for nonlinear optical (NLO) materials, compounds featuring mixed-type supertetrahedral frameworks remain notably rare. Herein, we report a salt-inclusion chalcogenide, K3Mg2[K6MgCl3][Ga20S36] (1), characterized by a diamond-like framework synergistically assembled from T2- and C2-type supertetrahedra. Notably, compound 1 exhibits a competitive second-harmonic generation (SHG) response of 1.1 × AgGaS2 (@1700 nm) originating from the ordered packing of the supertetrahedral units. Furthermore, the inclusion of cations and polycations in the supertetrahedral framework of 1 yields a wide band gap (3.20 eV), which results in a remarkably high laser-induced damage threshold (LIDT) of 8.0 × AgGaS2 at 1064 nm. This work provides a rational design strategy for the development of advanced NLO materials based on mixed-type supertetrahedral architectures.
Authors
- Xiao‐Ming Jiang (ORCID: https://orcid.org/0000-0001-6837-4429)
- Jun-Long Chen (ORCID: https://orcid.org/0000-0002-7375-6525)
- Bin‐Wen Liu (ORCID: https://orcid.org/0000-0003-1061-1000)
- Shao‐Min Pei
- Guo G
Institutions
- Chinese Academy of Sciences (CN)
- Fujian Institute of Research on the Structure of Matter (CN)
- State Key Laboratory of Structural Chemistry
- Fuzhou University (CN)
Publication Details
- Journal
- Chemistry of Materials
- Published
- 2026-04-22
- DOI
- https://doi.org/10.1021/acs.chemmater.6c00490
- Primary Topic
- Crystal Structures and Properties
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Natural Science Foundation of China
- Chinese Academy of Sciences
- Haixi Institute, Chinese Academy of Sciences
- Natural Science Foundation of Fujian Province