Three-Dimensional Open-Framework Germanate Built from a Novel Ge₁₃ Cluster and Containing Two Types of Chiral Layers

Abstract

Ge 15 O 30 (OH) 4 ]•2(H 2 tren), denoted SU-69, was synthesized under hydrothermal conditions with tris(2-aminoethyl)-amine (tren) as a structure directing agent (SDA). SU-69 crystallizes in a monoclinic space group (C2/c, No. 15) with a = 20.2656(7) Å, b = 11.6250(4) Å, c = 18.5602(10) Å, and β = 90.528( 4)°. The framework of SU-69 is built from a novel Ge 13 O 27 (OH) 2 (Ge 13 ) cluster with two additional GeO 3 (OH) tetrahedra. Two types of chiral 3,6-net building layers are found in the framework, which alternately stack and connect to form a three-dimensional achiral framework with a two-dimensional 10 × 12-ring channel system. The SDA molecules interact with the framework via H-bonds. The thermal stability of as-synthesized SU-69 has also been investigated.

Structural Motifs in Aryl Organogermanium Ge-O Derivatives for Material Design

“…There are several structural types of these compounds, such as linear polymers, ladders, cages, and sheet-like structures. The Ge analogs of organosilsesquioxanes [7] and germanates [8][9][10] have attracted less attention. It is evident, however, that the introduction of germanium, instead of silicon, atoms (with a larger atom size and more acute bond angles) would significantly modify the structural features of compounds and their properties.…”