Fig. 3: Reversible photochromic transformation.

a Time-dependent UV−vis diffuse reflectance spectra of DBTB-DETH-COF. b Tauc plots of BP-DBTB-DETH-COF and AP-DBTB-DETH-COF. c photochromic transformation cycles.
a Time-dependent UV−vis diffuse reflectance spectra of DBTB-DETH-COF. b Tauc plots of BP-DBTB-DETH-COF and AP-DBTB-DETH-COF. c photochromic transformation cycles.