Department of Chemistry, The Pennsylvania State University , University Park, Pennsylvania 16802, United States.
J Am Chem Soc. 2013 Nov 6;135(44):16276-9. doi: 10.1021/ja4083254. Epub 2013 Oct 24.
Metal-organic frameworks (MOFs) provide access to structures with nanoscale pores, the size and connectivity of which can be controlled by combining the appropriate metals and linkers. To date, there have been no reports of using MOFs as templates to make porous, crystalline metal oxides. Microporous titania replicas were made from the MOF template HKUST-1 by dehydration, infiltration with titanium isopropoxide, and subsequent hydrothermal treatment at 200 °C. Etching of the MOF with 1 M aqueous HCl followed by 5% H2O2 yielded a titania replica that retained the morphology of the parent HKUST-1 crystals and contained partially ordered micropores as well as disordered mesopores. Interestingly, the synthesis of porous titania from the HKUST-1 template stabilized the formation of brookite, a rare titania polymorph.
金属-有机骨架（MOFs）提供了一种途径，可以获得具有纳米级孔的结构，通过组合适当的金属和连接体，可以控制其尺寸和连通性。迄今为止，尚无将 MOFs 用作模板来制备多孔、结晶金属氧化物的报道。通过脱水、钛异丙醇盐渗透以及随后在 200°C 下进行水热处理，从 MOF 模板 HKUST-1 中制得微孔氧化钛的复制品。用 1 M 盐酸刻蚀 MOF，然后用 5%的 H2O2 处理，得到的氧化钛复制品保留了母体 HKUST-1 晶体的形态，并含有部分有序的微孔和无序的介孔。有趣的是，从 HKUST-1 模板合成多孔氧化钛稳定了锐钛矿的形成，锐钛矿是一种罕见的 TiO2 多晶型物。
