| Abstract
| - Among the known zeolite topologies, odd rings are rare with theexception of 5-ring. We report here the hydrothermal synthesisand structural characterization of a novel compound, KBGe2O6,the first germanate-based zeotype material with 7-ring channels.It crystallized in the orthorhombic system, space group P212121(No. 19), a = 4.8037(3) Å, b = 10.2063(7) Å, c = 10.7402(10)Å, V = 526.57(5) Å3, Z = 3. The framework topology of thiscompound is previous unknown with the vertex symbol 4·6·4·6·6·72(vertex1), 4·6·4·6·6·72(vertex2), and 6·6·6·6·62·72(vertex3).It is worth noting that the structure of the compound is chiralcontaining helices condensed from GeO4 tetrahedra, which arrangearound 21 screw axes. Furthermore, the K+ ions within the channelsare mobile and can be partially ion-exchanged with Na+ at roomtemperature.
- The synthesis and structure of a chiral zeotype borogermate with 7-ring channels was described. The framework topology of this compound is previous unknown with the vertex symbol 4·6·4·6·6·72, 4·6·4·6·6·72(vertex2) and 6·6·6·6·62·72(vertex3).
|
