|(C ₆N ₄H ₂₁) ₂|[Ge ₇O ₁₄F ₆]: A new germanate compound constructed from alternately stacked pseudo triple-sheet layers

A novel layered germanate compound, |(C ₆N ₄H ₂₁) ₂|[Ge ₇O ₁₄F ₆] (JU-86, JU = Jilin University), was solvothermally synthesized. Its structure consists of 4.6-net sheets built up from dissymmetric 8 ³ building units. Different from those found in several metal phosphate compounds, half of the 4.6-net sheets in JU-86 are constructed from right-handed 8 ³ building units and the other half are constructed from left-handed ones. Right-handed and left-handed 4.6-net sheets are stacked alternately in JU-86. Each 4.6-net sheet is sandwiched by two layers of protonated tris(2-aminoethyl)amine (tren) molecules to form an unusual pseudo triple-sheet layer through hydrogen-bonding interactions. No hydrogen bonds are found between different pseudo triple-sheet layers.