| Autor: |
Liu Y; Department of Chemistry, University of California-Berkeley; Materials Sciences Division, Lawrence Berkeley National Laboratory ; and Kavli Energy NanoSciences Institute , Berkeley , California 94720 , United States., Diercks CS; Department of Chemistry, University of California-Berkeley; Materials Sciences Division, Lawrence Berkeley National Laboratory ; and Kavli Energy NanoSciences Institute , Berkeley , California 94720 , United States., Ma Y; School of Physical Science and Technology , Shanghai Tech University , Shanghai 201210 , China., Lyu H; Department of Chemistry, University of California-Berkeley; Materials Sciences Division, Lawrence Berkeley National Laboratory ; and Kavli Energy NanoSciences Institute , Berkeley , California 94720 , United States., Zhu C; Advanced Light Source , Lawrence Berkeley National Laboratory , Berkeley , California 94720 , United States., Alshmimri SA; UC Berkeley-KACST Joint Center of Excellence for Nanomaterials for Clean Energy Applications , King Abdulaziz City for Science and Technology , Riyadh 11442 , Saudi Arabia., Alshihri S; UC Berkeley-KACST Joint Center of Excellence for Nanomaterials for Clean Energy Applications , King Abdulaziz City for Science and Technology , Riyadh 11442 , Saudi Arabia., Yaghi OM; Department of Chemistry, University of California-Berkeley; Materials Sciences Division, Lawrence Berkeley National Laboratory ; and Kavli Energy NanoSciences Institute , Berkeley , California 94720 , United States.; UC Berkeley-KACST Joint Center of Excellence for Nanomaterials for Clean Energy Applications , King Abdulaziz City for Science and Technology , Riyadh 11442 , Saudi Arabia. |
| Abstrakt: |
A new mode of mechanical entanglement in extended structures is described where 1D organic ribbons of corner-sharing squares are mutually interlocked to form 3D woven covalent organic framework-500, COF-500. Reaction of aldehyde-functionalized tetrahedral Cu(PDB) 2 PO 2 Ph 2 complexes (PDB = 4,4'-(1,10-phenanthroline-2,9-diyl)dibenzaldehyde) with rectangular tetratopic ETTBA (4',4‴,4''''',4''''‴-(ethene-1,1,2,2-tetrayl)tetrakis([1,1'-biphenyl]-4-amine)) linkers through imine condensation, yielded a crystalline porous metalated COF, COF-500-Cu, with pts topology. Upon removal of the Cu(I) ions, the individual 1D square ribbons in the demetalated form (COF-500) are held together only by mechanical interlocking of rings, which allows their collective movement to produce a narrow-pore form, as evidenced by nitrogen adsorption and solid-state photoluminescence studies. When exposed to tetrahydrofuran vapor, the interlocking ribbons can dynamically move away from each other to reopen up the structure. The structural integrity of COF-500 is maintained during its dynamics because the constituent square ribbons cannot part company due to spatial confinement imparted by their interlocking nature. |
