New cationic spiropyrans (SP–R)+X− (R = Me, Ph, Hex, C2H4OH; X = I, Cl, NO3) have been synthesised and embedded in a silica gel prepared from the gelation of TMOS (tetramethyloxysilane). The influence of the substituent R and of the anion on the gelation time has been studied. Spectroscopic studies of these new spiropyran-doped gels provide evidence for negative solvatochromism and for a competition between normal and reverse photochromism.
No takes yet. Share an insight, caveat, or question.
Léaustic et al. (2001) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: