Single-crystal-to-single-crystal transformation of Di(isopropylammonium) (Z,Z)-muconate into the (E,E)-muconate during one-way photoisomerization in the solid state

摘要

The solid-state EZ photoisomerization of di(isopropylammonium) (Z,Z)-muconate (ZZ-1a) into the corresponding EE isomer (EE-1a) via a single-crystal-to-single-crystal reaction process was investigated. The molecular motion based on a bicycle-pedal model was directly observed during the photoisomerization in the crystals by an X-ray single crystal structure analysis. The photoirradiation of ZZ-1a provided EE-1a in a quantitative yield via a one-way isomerization mechanism, being different from the solution products in the photostationary state. The isomerization reactivity was discussed for the ammonium and ester derivatives of muconic acid.