(A) new zirconium metal organic framework construct from hexagonal and triangular building units

Abstract

A new Zirconium Metal Organic Framework, MOF-777, $[Zr_6O_4(OH)_4](HCOO)_4(OH)_2(H_2O)_4BTB_2$, (BTB = 1,3,5-tris(4-carboxyphenyl)benzene), was synthesized and structurally characterized by single crystal x-ray diffraction data. The struc-ture is composed of hexagonal $[Zr_6O_4(OH)_4(HCOO)_4(OH)_2(H_2O)_4(-COO)_6]$ secondary build-ing units and BTB linkers, where each SBU is linked by BTB units. The overall structure has tfz-d type topology which is based on stacking of kgd-a type 2D structure. The calculated pore diameter and surface area are 4.986Å and $2330m^2/g$, respectively. From the TGA and stability test in water, it is confirm that MOF-777 has similar thermal stability up to around 550℃ and chemical stability in organic and aqueous media as the reported Zr MOFs which are known for the most stable MOFs among the reported MOFs. The Hf analogue of this structure were synthesized and structurally characterized in the same manner.