A two-dimensional conjugated polymer framework with fully sp2-bonded carbon skeleton

By Xiaodong Zhuang, Wuxue Zhao, Fan Zhang, Yu Cao, Feng Liu, Shuai Bi, Xinliang Feng. 2016

226 citations recorded by the source corpus.

The synthesis of crystalline two-dimensional (2D) covalent organic frameworks (COFs) with fully unsaturated carbon–carbon backbones via a solution approach remains a great challenge. In this work, we report the first example of an olefin-linked 2D conjugated COF using a Knoevenagel polycondensation reaction of 1,4-phenylene diacetonitrile and three armed aromatic aldehyde. The resulting 2D poly(phenelyenevinylene) framework (2DPPV) possesses a sheet morphology, and a crystalline layered structure featuring a fully sp2-bonded carbon skeleton with pendant cyanide groups. Its unique alternating structure with a serrated configuration has been essentially evaluated using HR-TEM TEM analysis, nitrogen physisorption measurements, PXRD studies and theoretical simulations. Upon thermal and activation treatments, the as-prepared 2DPPV can be facilely converted into porous carbon nanosheets with large specific surface areas of up to 880 m2 g−1 which exhibit an excellent electrochemical performance as supercapacitor electrodes and electrocatalysts for the oxygen reduction reaction. This represents an economic non-template approach to 2D porous carbon materials for energy-related applications.

Subfields: Inorganic Chemistry, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/336f14812d62968fca54cc12c84d253c1e31f3ab

Citations in the corpus

• Covalent Organic Frameworks: Organic Chemistry Extended into Two and Three Dimensions (2019, unknown): “We demonstrate that COF synthesis no longer relies exclusively on functionally reversible linkages, and how synthetic strategies for COFs that are formed from readily reversible linkages have been refined to produce materials of increasing crystallinity (see Glossary) and domain size, for the first ”
• Two-dimensional sp2 carbon–conjugated covalent organic frameworks (2017, unknown): “Note that a 2D sheet can form, with restricted π-conjugation blocked at the point of vertices, as occurs in 2DPPV (twodimensional polyphenylenevinylene framework) knotted by all meta-substituted 1,3,5-phenyl focal units (14).”
• The atom, the molecule, and the covalent organic framework (2017, unknown): “These are (i) B–O (boroxine, boronate ester, borosilicate, and spiroborate) (6, 33, 34); (ii) C=N (imine, hydrazone, and squaraine) (31, 35, 36); (iii) C=N(aromatic) (triazine and phenazine) (37, 38); (iv) C=C (alkene) (39); (v) C–N (b-ketoenamine, imide, and amide) (40–42); and (vi) B=N (borazine) ”