SU-62: Synthesis and Structure Investigation of a Germanate with a Novel Three-Dimensional Net and Interconnected 10- and 14-Ring Channels

A novel 3D open-framework germanate, |N2C4H14|4 [Ge20O41(OH)6]·3H2O (SU-62), was prepared from
hydrothermal
synthesis using 1,4-diaminobutane as the organic structure directing
agent (SDA). The crystal structure was solved by single crystal X-ray
diffraction. The framework is built from Ge10(O,OH)27 (Ge10) secondary building units and exhibits
an irregular three-dimensional channel system encircled by 10- and
14-rings. The framework of SU-62 has an underlying topology that follows
a novel five-coordinated svh-5-I41/amd net, while the pores follow the tsi net. The thermal behavior of SU-62 was studied by thermogravimetric
(TG) analysis and in situ X-ray diffraction (XRPD).
Crystallographic data: orthorhombic, space group Fdd2, unit cell parameters a = 15.297(3) Å, b = 53.58(1) Å, c = 14.422(3) Å, V = 11821(4) Å3, Z = 8.