Department of Chemistry, University of California-Berkeley; Materials Sciences Division, Lawrence Berkeley National Laboratory; Kavli Energy NanoSciences Institute at Berkeley; and Berkeley Global Science Institute, Berkeley, California 94720, United States.
Vietnam National University-Ho Chi Minh City (VNU-HCM) , Ho Chi Minh City 721337, Vietnam.
J Am Chem Soc. 2016 Apr 6;138(13):4330-3. doi: 10.1021/jacs.6b01233. Epub 2016 Mar 23.
A crystalline material with a two-dimensional structure, termed metal-organic framework-901 (MOF-901), was prepared using a strategy that combines the chemistry of MOFs and covalent-organic frameworks (COFs). This strategy involves in situ generation of an amine-functionalized titanium oxo cluster, Ti6O6(OCH3)6(AB)6 (AB = 4-aminobenzoate), which was linked with benzene-1,4-dialdehyde using imine condensation reactions, typical of COFs. The crystal structure of MOF-901 is composed of hexagonal porous layers that are likely stacked in staggered conformation (hxl topology). This MOF represents the first example of combining metal cluster chemistry with dynamic organic covalent bond formation to give a new crystalline, extended framework of titanium metal, which is rarely used in MOFs. The incorporation of Ti(IV) units made MOF-901 useful in the photocatalyzed polymerization of methyl methacrylate (MMA). The resulting polyMMA product was obtained with a high-number-average molar mass (26 850 g mol(-1)) and low polydispersity index (1.6), which in many respects are better than those achieved by the commercially available photocatalyst (P-25 TiO2). Additionally, the catalyst can be isolated, reused, and recycled with no loss in performance.
一种具有二维结构的结晶材料，称为金属-有机骨架-901（MOF-901），是通过结合金属有机骨架（MOFs）和共价有机骨架（COFs）的化学方法制备的。该策略涉及原位生成胺功能化的钛氧簇 Ti6O6(OCH3)6(AB)6（AB = 4-氨基苯甲酸酯），然后通过亚胺缩合反应与苯-1,4-二醛连接，这是 COFs 的典型反应。MOF-901 的晶体结构由六方多孔层组成，这些层可能以交错构象（hxl 拓扑）堆叠。这种 MOF 代表了将金属簇化学与动态有机共价键形成相结合以获得新的结晶扩展钛金属骨架的首例，钛金属在 MOFs 中很少使用。Ti(IV)单元的掺入使 MOF-901 可用于甲基丙烯酸甲酯（MMA）的光催化聚合。所得聚 MMA 产物的数均摩尔质量（26850 g mol(-1)) 较高，多分散指数（1.6）较低，在许多方面优于市售光催化剂（P-25 TiO2）的性能。此外，催化剂可以通过分离、重复使用和回收而不损失性能。
