A crystalline germanate with mesoporous 30-ring channels.

Area of Science:

• Materials Science
• Inorganic Chemistry
• Crystallography

Background:

• Open-framework materials are crucial for applications like catalysis and gas storage.
• The synthesis of novel structures with large pore sizes remains a significant challenge.
• Germanate materials offer unique structural diversity and potential for large pores.

Purpose of the Study:

• To synthesize and characterize a novel germanate with exceptionally large pore channels.
• To investigate the structural features and pore dimensions of the new material.
• To explore the potential of germanate clusters in constructing advanced open-frameworks.

Main Methods:

• Solvothermal synthesis conditions were employed to obtain the germanate.
• Structural characterization was performed using techniques suitable for crystalline materials.
• The framework topology was analyzed based on the constituent germanate clusters.

Main Results:

• A novel germanate, C(6)N(2)H(18)[Ge(9)O(18)X(4)](6)[Ge(7)O(14)X(3)](4)[Ge(7)O(14.42)X(2.58)](8)[GeX(2)](1.73) (X = OH, F), was successfully synthesized.
• The material exhibits 30-ring channels, the largest reported for crystalline open-frameworks.
• A mesoporous pore size of 13.0 x 21.4 Ų was determined.

Conclusions:

• The synthesized germanate represents a significant advancement in open-framework materials due to its record-breaking pore size.
• The framework is constructed from Ge(7) and Ge(9) clusters, integrated into a 3-D net structure.
• This discovery provides a new platform for designing materials with enhanced properties for various applications.