New Photochrome Probe Allows Simultaneous pH and Microviscosity Sensing

Yuanyuan Wu, Vladislav Papper, Oleksandr Pokholenko, Vladimir Kharlanov, Yubin Zhou, Terry W.J. Steele, Robert S. Marks

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


4-N,N′-dimethylamino-4′-N′-stilbenemaleamic acid (DASMA), a unique molecular photochrome probe that exhibits solubility and retains trans-cis photoisomerisation in a wide range of organic solvents and aqueous pH environments, was prepared, purified and chemically characterised. Absorption, fluorescence excitation and emission spectra and constant-illumination fluorescence decay were measured in acetonitrile, dimethyl sulfoxide, ethanol, propylene carbonate, and aqueous glycerol mixtures. The pseudo-first-order fluorescence decay rates were found to be strongly dependent on the medium viscosity. In addition, the molecule exhibited the pH-dependent fluorescence and photoisomerisation kinetics.

Original languageEnglish
Pages (from-to)961-972
Number of pages12
JournalJournal of Fluorescence
Issue number4
StatePublished - 13 Jul 2015
Externally publishedYes


  • Fluorescence
  • Intramolecular charge transfer
  • Maleamic acid
  • Microviscosity
  • Photochrome probe
  • Photoisomerisation
  • Stilbene
  • Viscosity sensor
  • pH sensor


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