Novel zeolite framework LMU-2

unveiling of CHA-related structure with active sites by Co-complex structure-directing agent

authored by

Janina Carolin Höner, Andreas Schaate, Andreas M. Schneider, Jonas Blaser, Hubert Koller, Yaşar Krysiak, Peter Behrens

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.

Organisation(s)

Institut für Anorganische Chemie
Hannover School for Nanotechnology
PhoenixD: Simulation, Fabrikation und Anwendung optischer Systeme
Laboratorium für Nano- und Quantenengineering

External Organisation(s)

Westfälische Wilhelms-Universität Münster (WWU)

Type

Artikel

Journal

Microporous and Mesoporous Materials

Volume

402

ISSN

1387-1811

Publication date

26.11.2025

Publication status

Elektronisch veröffentlicht (E-Pub)

Peer reviewed

Yes

ASJC Scopus Sachgebiete

Allgemeine Chemie, Allgemeine Materialwissenschaften, Physik der kondensierten Materie, Werkstoffmechanik

Electronic version(s)

https://doi.org/10.1016/j.micromeso.2025.113960 (Access: Offen)