Fig. 7: Transient absorption spectra of DBTB-DETH-COF.

a DBTB-DETH-COF under N2 atmosphere. b two-dimensional spectro-temporal transient absorption map showing the change in optical density (OD) in N2. c DBTB-DETH-COF under O2 atmosphere. d two-dimensional spectro- temporal transient absorption map showing the change in optical density (OD) in O2 (343 nm excitation).