Abstract
A new open-framework germanate [Ge15O30(OH)4]·2(H2tren), 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) A, b = 11.6250(4) A, c = 18.5602(10) A, and β = 90.528(4)°. The framework of SU-69 is built from a novel Ge13O27(OH)2 (Ge13) cluster with two additional GeO3(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.
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