Fig. 1: Diselenide bond-exchange mechanism and molecular characterization.
From: Visible-light-programmed patterning in dynamically bonded cholesteric liquid crystal elastomer
a Free radical-induced bond-exchange reaction occurs between Se–LC and Se–OH. b Simulated structures of Se–LC, Se–OH, and exchange products. c Free energy changes in the bond-exchange reaction in (a). d EPR of Se–LC and Se–OH after exposure to a 405 nm light source. e 77Se NMR spectra of Se–LC, Se–OH and mix the two in equal molar ratios. f 1H NMR spectra after adding Se–OH to Se–LC in different ratios. g The DSC curves of the Se–LC upon different thermal histories. h Dynamic XRD pattern upon the variable temperature of Se–LC.
