Synthesis and Characterization of a Novel Organically Templated Open Framework Zirconogermanate with Three- and Seven-Membered Rings

A new organically templated microporous zirconogermanate, (C2H10N2)H2O[ZrGe3O9] (denoted as FDZG-3), with a
low framework density of 13.6 T/1000 Å3, has been solvo/hydrothermally synthesized by using ZrO(NO3)2·2H2O as
a zirconium source and triethylenetetramine (TETA) as a structure direct agent. This compound was characterized
by means of single-crystal X-ray diffraction analysis, thermogravimetrical analysis, and IR and UV−vis spectra. Its
three-dimensional (3D) framework is built up by 1D sinusoidal germanate chains cross-linked by ZrO6 octahedra,
which forms a network containing three- and seven-membered rings (MRs). Four intersecting 7-MR channels can
be observed along the b axis, c axis, [110], and [−110] directions, respectively. Charge-balancing (C2H10N2)2+ and
extraframework water molecules are encapsulated within 7-MR channels and form hydrogen bonds with framework
oxygen atoms. Crystal data for FDZG-3:  M = 533.13, monoclinic, space group Cc (No.9), a = 11.299(3) Å, b =
7.7649(19) Å, c = 13.835(3) Å, β = 104.826(3)°, V = 1173.4(5) Å3, Z = 4, R1 = 0.0263, wR2 = 0.0529.