A 2D covalent organic framework with 4.7-nm pores and insight into its interlayer stacking.
Two-dimensional layered covalent organic frameworks (2D COFs) organize π-electron systems into ordered structures ideal for exciton and charge transport and exhibit permanent porosity available for subsequent functionalization. A 2D COF with the largest pores reported to date was synthesized by condensing 2,3,6,7,10,11-hexahydroxytriphenylene (HHTP) and 4,4'-diphenylbutadiynebis(boronic acid) (DPB). The COF was prepared as both a high surface area microcrystalline powder as well as a vertically oriented thin film on a transparent single-layer graphene/fused silica substrate. Complementary molecular dynamics and density functional theory calculations provide insight into the interlayer spacing of the COF and suggest that adjacent layers are horizontally offset by 1.7-1.8 Å, in contrast to the eclipsed AA stacking typically proposed for these materials.
Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York 14853, USA.
Eric L
EL
Spitler
Brian T
BT
Koo
Jennifer L
JL
Novotney
John W
JW
Colson
Fernando J
FJ
Uribe-Romo
Gregory D
GD
Gutierrez
Paulette
P
Clancy
William R
WR
Dichtel