A further development for porpholactone-based high pH sensors: They have become water-soluble and can be incorporated into Nation membranes. Worlinsky, J. L.; Halepas, S.; Ghandehari, M.; Khalil, G.; Brückner, C. ‘Oxazolochlorins 15. High pH Sensing with Water-soluble Porpholactone Derivatives and their Incorporation into a Nafion® Optode Membrane’ Analyst 2015, 140, 190–196. DOI: 10.1039/c4an01462f
The paper was selected as HOT article and discussed on the Analyst Blog: http://blogs.rsc.org/an/