Germanate Zeolites: Contrasting the Behavior of Germanate and Silicate Structures Built from Cubic T8O20 Units (T=Ge or Si)

Abstract

A brief review of germanate-based zeolitelike structures is given. The frameworks of new germanates containing cubic Ge 8 O 20 clusters are analyzed in detail and compared with those of related silicates. It is shown that some topologies are suitable for silicates, but not for germanates; that others are suitable for germanates but not for silicates; and that a third class is suitable for both types of material.

Electroactive Nanoporous Metal Oxides and Chalcogenides by Chemical Design

“…27 Indeed, large numbers of germanates that are isostructural to natural silicates have been synthesized. Some differences exist between the Si–O–Si motif and the Ge–O–Ge motif, 25 for example, the Ge–O bond is longer and the germanate angle is smaller than the silicate species. 28 The difference in bond length is related to ionic radius, while the variation in bond angle can be understood in the context of the valence shell electron pair repulsion (VSEPR) model.…”

Extra‐Large‐Pore Zeolites: Bridging the Gap between Micro and Mesoporous Structures

“…None of the frameworks is stable, they collapse when the guests are removed by calcination 35. 36, 39, 43…”

|(C6N4H21)2|[Ge7O14F6]: A New Germanate Compound Constructed from Alternately Stacked Pseudo Triple‐Sheet Layers

“…Each Ge(3) atom is tetrahedrally coordinated to one terminal and three bridging oxygen atoms, which link each Ge(3) atom with three adjacent Ge(1) atoms. The Ge–(O, F) bond lengths and angles in JU‐86 are in agreement with those in previously reported open‐framework germanate structures 5,6. Crystal data, atomic coordinates, bond lengths, bond angles, and anisotropic displacement parameters for JU‐86 are available in Tables S1–S5 (Supporting Information).…”