1 research outputs found
Two-Dimensional Imine-Linked Covalent Organic Frameworks as a Platform for Selective Oxidation of Olefins
Two-dimensional imine-linked
covalent organic frameworks with hydroxyl groups, <b>TAPT-DHTA-COF<sub>HX</sub></b> and <b>TAPT-DHTA-COF<sub>DMF</sub></b>, were
respectively constructed by the condensation of 1,3,5-tris-(4-aminophenyl)triazine
and 2,5-dihydroxyl-terephthalaldehyde under solvothermal and reflux
conditions. Both COFs possess excellent thermal stability and a similar
eclipsed stacking structure verified by XRD patterns. However, <b>TAPT-DHTA-COF<sub>HX</sub></b> presented a larger surface area
(2238 m<sup>2</sup>/g) and higher crystallinity than <b>TAPT-DHTA-COF<sub>DMF</sub></b>. Significantly, copper ions are efficiently incorporated
into the pores of these two COFs via the coordination interaction
with hydroxyl groups and imine linkers. The obtained copper-containing
COFs (<b>Cu-COF<sub>HX</sub></b> and <b>Cu-COF<sub>DMF</sub></b>) were employed in the selective oxidation of styrene to benzaldehyde. <b>Cu-COF<sub>HX</sub></b> with superior surface area (1886 m<sup>2</sup>/g) and pore volume (1.11 cm<sup>3</sup>/g) exhibited excellent
catalytic performance and recyclability. This strategy not only provides
a convenient approach to design imine-linked 2D COFs with hydroxyl
groups, but also develops their novel application for catalysis