Physicochemical properties at the liquid/liquid interface of a neutral nitrobenzospiropyran derivative in response to light and pH stimuli

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The photo- and pH-responsive physicochemical properties of the neutral nitrobenzospiropyran derivative (HSP) at the toluene/acidic-water interface were investigated. HSP undergoes photoisomerization to form zwitterionic merocyanine (HMC), and the protonation of HMC makes it a cationic state. Rapid conversion of the interfacial tension at the toluene/water interface was achieved by the photoisomerization and protonation of HSP. In addition, the applicability of light-induced control in emulsion formation was evaluated.