Abstract
During attempts to synthesize zirconium-based MOFs, we have obtained a new crystal structure of the cluster with Zr(6)O(8) core and formula unit [Zr(6)O(4)(OH)(4)(OH(2))(8)(CH(3)COO)(4)(SO(4))(4)]·nH(2)O. Unlike other systems, mild conditions were employed in this case; no strong acids or hydrothermal conditions were required. The molecular assembly in the crystal is characterized by strong O-H⋯O hydrogen bonds connecting neighboring molecules, allowing the formation of a three-dimensional maze of tunnels with H(2)O molecules stabilizing the framework. Noteworthy, at 100 °C, the strong Zr(6)O(8) core and the O-H⋯O hydrogen bonds help form a system where the molecular cluster is conserved, but the long-range order is lost. FT-IR, Raman, TGA, DSC, and X-ray diffraction techniques were used to characterize the title compound.