Fig. 1 | Nature Communications

Fig. 1

From: Ultrafast charge transfer coupled with lattice phonons in two-dimensional covalent organic frameworks

Fig. 1

Molecular structure and steady-state absorption spectra. a Molecular structure of two-dimensional covalent organic frameworks (COFs). For the clear visualization, the repeat units in 2D sheets are truncated from the stacked structure of COFs (green skeleton). The COFs consist of two units, 3,4,9,10-perylenetetracarboxylic acid diimide (PDI) and free-base porphyrin, which are colored in blue and red, respectively. b Electronic absorption spectrum of PDI-porphyrin COFs dispersed in DMF (black), together with the normalized absorption spectra of their precursor molecules, free-base porphyrin (red), and perylene-3,4,9,10-tetracarboxylic dianhydride called as PDA (blue)

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