title: Synthesis and Structure of KBGe2O6: the first chiral zeotype borogermanate with 7-ring channels.
abstract: Among the known zeolite topologies, odd rings are rare with the exception of 5-ring. We report here the hydrothermal synthesis and structural characterization of a novel compound, KBGe(2)O(6), the first germanate-based zeotype material with 7-ring channels. It crystallized in the orthorhombic system, space group P2(1)2(1)2(1) (No. 19), a = 4.8037(3) A, b = 10.2063(7) A, c = 10.7402(10) A, V = 526.57(5) A(3), Z = 3. The framework topology of this compound is previous unknown with the vertex symbol 4.6.4.6.6.7(2)(vertex1), 4.6.4.6.6.7(2)(vertex2), and 6.6.6.6.6(2) x 7(2)(vertex3). It is worth noting that the structure of the compound is chiral containing helices condensed from GeO(4) tetrahedra, which arrange around 2(1) screw axes. Furthermore, the K(+) ions within the channels are mobile and can be partially ion-exchanged with Na(+) at room temperature.
authors.affiliation: Coordination and Hydrothermal Chemistry Group, State Key Laboratory of the Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, P. R. China.
authors.forename: Zhi-En
authors.initials: ZE
authors.lastname: Lin
authors.forename: Jie
authors.initials: J
authors.lastname: Zhang
authors.forename: Guo-Yu
authors.initials: GY
authors.lastname: Yang