Fig. 3: Excited state ultrafast dynamics of UPy dimers.
From: Non-traditional fluorescence in quadruple hydrogen bonded supramolecular polymers
a ESPT process of UPy dimers. b The energy gap of three tautomeric forms of UPy-DHDI at S1 state by TD-DFT simulation. c, d Time-resolved transient absorption of PU-UPy film monitored by pump–probe setups, a Pharos laser with a center wavelength of 1030 nm was used. e The photophysical processes of UPy groups.
