title: A Titanium-Organic Framework as an Exemplar of Combining the Chemistry of Metal- and Covalent-Organic Frameworks.
abstract: 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.
authors.affiliation: 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.
authors.forename: Ha L
authors.initials: HL
authors.lastname: Nguyen
authors.affiliation: Department of New Architectures in Materials Chemistry, Materials Science Institute of Madrid, Consejo Superior de Investigaciones Científicas , Madrid 28049, Spain.
authors.forename: Felipe
authors.initials: F
authors.lastname: Gándara
authors.affiliation: 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.|King Fahd University of Petroleum and Minerals , Dhahran 34464, Saudi Arabia.
authors.forename: Hiroyasu
authors.initials: H
authors.lastname: Furukawa
authors.affiliation: Faculty of Chemistry, University of Science, VNU-HCM , Ho Chi Minh City 721337, Vietnam.
authors.forename: Tan L H
authors.initials: TL
authors.lastname: Doan
authors.affiliation: 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.|King Fahd University of Petroleum and Minerals , Dhahran 34464, Saudi Arabia.
authors.forename: Kyle E
authors.initials: KE
authors.lastname: Cordova
authors.affiliation: 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.|King Fahd University of Petroleum and Minerals , Dhahran 34464, Saudi Arabia.
authors.forename: Omar M
authors.initials: OM
authors.lastname: Yaghi