Novel zeolite framework LMU-2
unveiling of CHA-related structure with active sites by Co-complex structure-directing agent
Abstract
While alkylammonium salts or organic amines are commonly used as structure-directing agents (SDAs) to synthesize zeolites, metal complexes can also serve this purpose. In this study, we present a novel interrupted framework, which can be regarded as a precursor of the CHA framework type with a pure-silica composition. The polycrystalline yellow powder was synthesized using a cobalt (III)-triazacyclononane complex [Co( tacn )2]3+. Structure determination via 3D electron diffraction revealed details of the [Si–O⋅⋅⋅H⋅⋅⋅O–Si]– hydrogen bonds, which are periodically ordered. They connect the D6R units of the CHA precursor-type structure. Upon calcination, the organic component is removed, yielding a blue material, resulting in the fully connected chabazite structure. The blue color is characteristic for tetrahedrally coordinated Co2+, which is most likely located in the chabazite cage and coordinated to the 6-rings of the framework. Temperature-dependent powder diffraction analysis was used to investigate the structural transformation and the discontinuous decrease in the constants a and c of the hexagonal lattice. Finally, spectroscopic and sorption measurements were conducted to characterize the properties of the material.
Details
- Organisation(s)
-
Institute of Inorganic Chemistry
Hannover School for Nanotechnology
PhoenixD: Photonics, Optics, and Engineering - Innovation Across Disciplines
Laboratory of Nano and Quantum Engineering
- External Organisation(s)
-
University of Münster
- Type
- Article
- Journal
- Microporous and Mesoporous Materials
- Volume
- 402
- ISSN
- 1387-1811
- Publication date
- 15.02.2026
- Publication status
- Published
- Peer reviewed
- Yes
- ASJC Scopus subject areas
- General Chemistry, General Materials Science, Condensed Matter Physics, Mechanics of Materials
- Electronic version(s)
-
https://doi.org/10.1016/j.micromeso.2025.113960 (Access:
Open
)
