Zinc metalloporphyrin-functionalised nanoparticle anion sensorsElectronic supplementary information (ESI) available: synthetic procedure for 1 and 2, titration experimental protocol and nanoparticle TEM. See http://www.rsc.org/suppdata/cc/b3/b313658b/

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Abstract
Disulfide-functionalised zinc metalloporphyrins self-assembled on gold nanoparticles exhibit remarkable, surface-enhanced, anion binding affinities as compared to the free metalloporphyrin.